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Former first lady Barbara Bush (L) and first lady Michelle Obama walk into an event honoring the 5,000th winner of the "Daily Point of Light" award in the East Room of the White House in Washington July 15, 2013. REUTERS/Larry Downing ( USA-OBAMA/BUSH )

President Barack Obama with former President George H. W. Bush, first lady Michelle Obama and former first lady Barbara Bush, behind left, arrive to present the 5,000th Daily Point of Light Award to Floyd Hammer and Kathy Hamilton, a retired couple and farm owners from Union, Iowa, in the East Room of the White House in Washington, Monday, July 15, 2013. Obama welcomed Bush to the White House in a salute to public service and to the drive for volunteerism that the 41st president inspired with his "thousand points of light" initiative more than two decades ago. (AP Photo/Carolyn Kaster) ( Obama First President Bush )

Former U.S. President George H. W. Bush sits in a wheelchair as U.S. President Barack Obama (R) escorts him into the East Room during an event at the White House, July 15, 2013 in Washington, DC. Bush joined President Obama in hosting the event to honor the 5,000th Daily Point of Light Award winner. (Photo by Mark Wilson/Getty Images) ( 173497378 )

Former first lady Barbara Bush walks out of an event in the East Room of the White House, July 15, 2013 in Washington, DC. President Barack Obama hosted the event to honor the 5,000th Daily Point of Light Award winner. (Photo by Mark Wilson/Getty Images) ( 173500621 )

U.S. President Barack Obama (R) stands as former President George H. W. Bush is wheeled to his seat for an event to honor the winner of the 5,000th Daily Point of Light Award at the White House in Washington July 15, 2013. REUTERS/Kevin Lamarque ( USA-OBAMA/BUSH )

U.S. President Barack Obama speaks while flanked by former President George H. W. Bush (L) who is sitting in a wheelchair, during an event in the East Room at the White House, July 15, 2013 in Washington, DC. Bush joined President Obama in hosting the event to honor the 5,000th Daily Point of Light Award winner. (Photo by Mark Wilson/Getty Images) ( 173497628 )

US President Barack Obama applauds as former US President George H.W. Bush (L) attends a White House ceremony to recognize the Points of Light volunteer program in Washington, DC, July 15, 2013. President Obama and First Lady Michelle Obama hosted former President George H.W. Bush and former first lady Barbara Bush to honor the 5,000th Daily Points of Light Award winner. JIM WATSON/AFP/Getty Images ( 521366820 )

President Barack Obama speaks during a ceremony to present the 5,000th Daily Point of Light Award to Floyd Hammer and Kathy Hamilton, from Union, Iowa, in the East Room of the White House in Washington, Monday, July 15, 2013. Obama will try to ratchet up pressure on House Republicans this week to pass legislation overhauling the nation's immigration laws. He will do interviews from the White House Tuesday with Spanish language television stations from Dallas, Denver, Los Angeles and New York. The White House says the president will argue that immigration reform is in line with the nation's values and in the country's economic interests. (AP Photo/Carolyn Kaster) ( Obama Immigration )

US President Barack Obama listens as former US President George H. W. Bush speak during an event in the East Room of the White House July 15, 2013 in Washington, DC. Obama hosted former US President George H. W. Bush and Barbara Bush to honor the 5000th Daily Point of Light Award which is a program started in response to Bush's call for volunteerism. BRENDAN SMIALOWSKI/AFP/Getty Images ( 521367404 )

Former US President George H. W. Bush (L), US President Barack Obama (2nd L) listen as Outreach co-founders Floyd Hammer (2nd R) and Kathy Hamilton speak during an event in the East Room of the White House on July 15, 2013 in Washington. Obama hosted former Bush and his wife Barbara Bush to honor the 5000th Daily Point of Light Award which is a program started in response to Bush's call for volunteerism. BRENDAN SMIALOWSKI/AFP/Getty Images ( 521368930 )

Former President George H. W. Bush (L) and U.S. President Barack Obama (R) pose with Floyd Hammer (2nd-L) and Kathy Hamilton (2nd-R) after they received the Daily Point of Light Award during an event in the East Room during an event at the White House, July 15, 2013 in Washington, DC. Bush joined President Obama in hosting the event to honor the 5,000th Daily Point of Light Award winner. (Photo by Mark Wilson/Getty Images) ( 173502365 )

US President Barack Obama (L) and former US President George H.W. Bush attend a White House ceremony to recognize the Points of Light volunteer program in Washington, DC, July 15, 2013. President Obama and First Lady Michelle Obama hosted former President George H.W. Bush and former first lady Barbara Bush to honor the 5,000th Daily Points of Light Award winner. JIM WATSON/AFP/Getty Images ( 521366697 )

Former President George H. W. Bush sitting next to President Barack Obama, left, recognizes a member of the audience after presenting the 5,000th Daily Point of Light Award in the East Room of the White House of the White House in Washington, Monday, July 15, 2013. Obama welcomed Bush to the White House in a salute to public service and to the drive for volunteerism that the 41st president inspired with his "thousand points of light" initiative more than two decades ago. (AP Photo/Susan Walsh) ( Obama First President Bush )

Neil Bush speaks during an event in the East Room during an event at the White House, July 15, 2013 in Washington, DC. President Barack Obama hosted the event to honor the 5,000th Daily Point of Light Award winner. (Photo by Mark Wilson/Getty Images) ( 173500626 )

Former first lady Barbara Bush attends a White House ceremony to recognize the Points of Light volunteer program in Washington, DC, July 15, 2013. President Obama and First Lady Michelle Obama hosted former President George H.W. Bush and former first lady Barbara Bush to honor the 5,000th Daily Points of Light Award winner. JIM WATSON/AFP/Getty Images ( 521367401 )

Former US President George H.W. Bush attends a White House ceremony to recognize the Points of Light volunteer program in Washington, DC, July 15, 2013. President Obama and First Lady Michelle Obama hosted former President George H.W. Bush and former first lady Barbara Bush to honor the 5,000th Daily Points of Light Award winner. JIM WATSON/AFP/Getty Images ( 521366753 )

Former President George H. W. Bush, in a pair of red and white socks, participates in an award ceremony with President Barack Obama for the 5,000th Daily Point of Light Award ceremony in the East Room of the White House of the White House in Washington, Monday, July 15, 2013. The other shoes belong to, from top to bottom, President Barack Obama, Bush, first lady Michelle Obama and former first lady Barbara Bush. Obama welcomed Bush to the White House in a salute to public service and to the drive for volunteerism that the 41st president inspired with his "thousand points of light" initiative more than two decades ago. (AP Photo/Susan Walsh) ( Obama First President Bush )

Chairman of Points of Light Neil Bush (C) shakes hands with his father, former US President George H.W. Bush, while attending a White House ceremony to recognize the Points of Light volunteer program in Washington, DC, July 15, 2013. President Obama and First Lady Michelle Obama hosted former President George H.W. Bush and former first lady Barbara Bush to honor the 5,000th Daily Points of Light Award winner. JIM WATSON/AFP/Getty Images ( 521366746 )

President Barack Obama, center, looks at former President George H. W. Bush, right, during a ceremony to recognizes the 5,000th Daily Point of Light Award in the East Room of the White House in Washington, Monday, July 15, 2013. Obama welcomed Bush to the White House in a salute to public service and to the drive for volunteerism that the 41st president inspired with his "thousand points of light" initiative more than two decades ago. (AP Photo/Susan Walsh) ( Obama First President Bush )