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Baltimore Ravens head coach John Harbaugh addresses fans during a celebration of the NFL football team's Super Bowl championship at M&T Bank Stadium in Baltimore Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 Sunday. (AP Photo/Steve Ruark)

Baltimore Ravens fans fill the streets during a victory parade Tuesday, Feb. 5, 2013, in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday.(AP Photo/Steve Ruark)

Baltimore Ravens safety Ed Reed greets fans while riding in a Humvee during the Ravens victory parade Tuesday, Feb. 5, 2013, in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Baltimore Ravens retiring linebacker Ray Lewis (C) holds up the Vince Lombardi trophy as he stands with safety Ed Reed (L) during a rally at City Hall in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Baltimore Ravens quarterback and Super Bowl MVP Joe Flacco waves to the crowd gathered on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Linebacker Ray Lewis #52 of the Baltimore Ravens dances as he and teammates celebrate during their Super Bowl XLVII victory parade near M&T Bank Stadium on February 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers. (Photo by Patrick Smith/Getty Images)

Baltimore Ravens linebacker Ray Lewis, bottom center, holding the Vince Lombardi trophy, speaks to fans at a celebration at City Hall at the start of a Super Bowl victory parade Tuesday, Feb. 5, 2013, in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Baltimore Ravens retiring linebacker Ray Lewis gestures to the crowd gathered on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Thousands of Baltimore Ravens NFL football fans fill M&T Bank Stadium celebrate the team's Super Bowl championship during a rally in Baltimore on Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 in New Orleans on Sunday. (AP Photo/Steve Ruark)

A fan of NFL Super Bowl XLVII champion Baltimore Ravens waves a banner to celebrate their victory in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Fans of Super Bowl XLVII champion Baltimore Ravens celebrate their victory before a stadium rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Fans of Super Bowl XLVII champion Baltimore Ravens celebrate their victory before a stadium rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. The player cut-out (C) is of retiring Ravens' linebacker Ray Lewis. REUTERS/Gary Cameron

John Harbaugh, head coach of Super Bowl champions Baltimore Ravens, greets fans during the Ravens Victory Parade in Baltimore on February 5, 2013. The Ravens defeated the San Francisco 49's in the Super Bowl to win the NFL Championship in New Orleans on February 3. MOLLY RILEY/AFP/Getty Images

Baltimore Ravens safety Ed Reed waves to the crowd gathered on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Fans of Super Bowl XLVII champion Baltimore Ravens run onto their home stadium's playing field before a rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Baltimore Ravens retiring linebacker Ray Lewis takes pictures of fans on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Super Bowl XLVII champion Baltimore Ravens head coach John Harbaugh (R) takes a photo of team running back Ray Rice (L) at a team and fan victory rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Baltimore Ravens retiring linebacker Ray Lewis waves to fans on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Fans of Super Bowl XLVII champion Baltimore Ravens run onto their home stadium's playing field before a rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Camero

Baltimore Ravens fans break through barriers and walk with players during a victory parade Tuesday, Feb. 5, 2013, in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Baltimore Ravens quarterback and Super Bowl MVP Joe Flacco waves to the crowd gathered on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII in New Orleans. REUTERS/Richard Clement

Wide receiver Torrey Smith of the Super Bowl champion Baltimore Ravens, hoists the Vince Lombardi trophy as he and his teammates take part in the Ravens victory parade in Baltimore, Maryland on February 5, 2013. The Ravens defeated the San Francisco 49's 34-31 to win the NFL Championship in New Orleans, on February 3, 2013. MOLLY RILEY/AFP/Getty Images

Super Bowl XLVII champion Baltimore Ravens safety Ed Reed sings to the crowd at a fan and team victory rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. The child on Reed's shoulders is unidentified. REUTERS/Gary Cameron

Fans of Super Bowl XLVII champion Baltimore Ravens run onto their home stadium's playing field before a rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Baltimore Ravens fans cheer at a victory ceremony at City Hall Tuesday, Feb. 5, 2013 in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)(AP Photo/Gail Burton)

Fans of Super Bowl XLVII champion Baltimore Ravens display their homemade version of the championship NFL Vince Lombardi trophy before a rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

A man and his son, fans of Super Bowl XLVII champion Baltimore Ravens, celebrate their victory before a stadium rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Head coach John Harbaugh of the Baltimore Ravens celebrates with fans during their Super Bowl XLVII victory parade at M&T Bank Stadium on February 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers. (Photo by Patrick McDermott/Getty Images)

Two fans of Super Bowl XLVII champion Baltimore Ravens exchange high fives before a stadium victory rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Fans of Super Bowl XLVII champion Baltimore Ravens celebrate their victory before a stadium rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. The player cut-out (L) is of retiring Ravens' linebacker Ray Lewis. REUTERS/Gary Cameron

A fan of Super Bowl XLVII champion Baltimore Ravens holds up a large cut-out of retiring linebacker Ray Lewis before a stadium rally in Baltimore February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Gary Cameron

Baltimore Ravens quarterback and Super Bowl MVP Joe Flacco gestures while riding in a Humvee during the Ravens victory parade Tuesday, Feb. 5, 2013, in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Sam Muffoletto, 21, and Phil Luzi, 21, hold up signs and a home-made Super Bowl trophy as they wait for the start of Baltimore's celebration for the Super Bowl champion Baltimore Ravens at Ravens stadium on Tuesday, Feb. 5, 2013. Officials expect about 100,000 people to attend the events. (AP Photo/Alex Dominguez)

Baltimore Ravens linebacker Ray Lewis, holding the Vince Lombardi trophy, speaks to fans at a celebration at City Hall at the start of a Super Bowl victory parade Tuesday, Feb. 5, 2013, in Baltimore. Super Bowl MVP and Ravens quarteback Joe Flacco, third from left, smiles. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Baltimore Ravens running back Ray Rice, left, dances on a float with other players during a victory parade Tuesday, Feb. 5, 2013, in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Baltimore Ravens retiring linebacker Ray Lewis gives a thumbs-up to fans on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Baltimore Ravens quarterback and Super Bowl MVP Joe Flacco waves to the crowd gathered on the team's parade route in Baltimore, Maryland February 5, 2013. The Ravens defeated the San Francisco 49ers to win the NFL championship. REUTERS/Richard Clement

Baltimore Ravens rookie kicker Justin Tucker points to the sky at the start of a victory parade outside of City Hall Tuesday, Feb. 5, 2013 in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)

Baltimore Ravens fans blow horns during a victory ceremony at City Hall Tuesday, Feb. 5, 2013 in Baltimore. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Gail Burton)(AP Photo/Gail Burton)

Baltimore Ravens linebacker Ray Lewis holds up the Vince Lombardi NFL football championship trophy during a celebration of the team's Super Bowl championship at M&T Bank Stadium in Baltimore Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 in Super Bowl XLVII on Sunday. (AP Photo/Steve Ruark)

Baltimore Ravens safety Ed Reed greets fans celebrating the NFL football team's Super Bowl championship during a parade in Baltimore on Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 in New Orleans on Sunday. (AP Photo/Steve Ruark)

Baltimore Ravens wide receiver Torrey Smith, center, holds the Vince Lombardi championship trophy during a parade and celebration of the team's NFL football Super Bowl championship in Baltimore on Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 on Sunday in New Orleans. (AP Photo/Steve Ruark)

Baltimore Ravens linebacker Ray Lewis waves to fans celebrating the NFL football team's Super Bowl championship during a parade in Baltimore on Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 in New Orleans on Sunday. (AP Photo/Steve Ruark)

Baltimore Ravens linebacker Ray Lewis, right, and safety Ed Redd dance during a championship celebration at the team's stadium in Baltimore, Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers in NFL football's Super Bowl XLVII 34-31 on Sunday. (AP Photo/Steve Ruark)

MVP Quarterback Joe Flacco #5 of the Baltimore Ravens celebrates with his teammates as they celebrate during their Super Bowl XLVII victory parade at M&T Bank Stadium on February 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers. (Photo by Patrick McDermott/Getty Images)

The Baltimore Ravens band marches down the street during their Super Bowl XLVII victory parade near M&T Bank Stadium on February 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers. (Photo by Patrick Smith/Getty Images)

Linebacker Terrell Suggs #55 of the Baltimore Ravens kisses The Vince Lombardi Trophy as he and teammates celebrate during their Super Bowl XLVII victory parade near M&T Bank Stadium on February 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers. (Photo by Patrick Smith/Getty Images)

Safety Ed Reed #20 of the Baltimore Ravens waves to fans as he and teammates celebrate during their Super Bowl XLVII victory parade near M&T Bank Stadium on February 5, 2013 in Baltimore, Maryland. The Baltimore Ravens captured their second Super Bowl title by defeating the San Francisco 49ers. (Photo by Patrick Smith/Getty Images)

The Baltimore Ravens Super Bowl victory parade makes its way through the streets of Baltimore on February 5, 2013. The Ravens defeated the San Francisco 49's in the Super Bowl to win the NFL Championship in New Orleans on February 3. MOLLY RILEY/AFP/Getty Images

Baltimore Ravens quarterback Joe Flacco acknowledges fans during a celebration of the team's Super Bowl championship at M&T Bank Stadium in Baltimore Tuesday, Feb. 5, 2013. The Ravens defeated the San Francisco 49ers 34-31 in Super Bowl XLVII on Sunday. (AP Photo/Steve Ruark)