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Guests arrive, bundled up during an arctic freeze, outside the Washington National Cathedral where U.S. President Barack Obama will attend a National Day of Prayer with Vice President Joe Biden, administration officials, congressional leaders, VIPs and guests to begin his second term of office, in Washington January 22, 2013. REUTERS/Mike Theiler

A guest in gloves holds an official program as he leaves the Washington National Cathedral where U.S. President Barack Obama attended a National Day of Prayer with Vice President Joe Biden, administration officials, congressional leaders, VIPs and guests to begin his second term of office, in Washington January 22, 2013. REUTERS/Mike Theiler

(Front L-R)US President Barack Obama, First Lady Michelle Obama, Dr. Jill Biden and Vice President Biden arrive to attend a prayer service at Washington National Cathedral on January 22, 2013 in Washington, DC. SAUL LOEB/AFP/Getty Images

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and his wife Jill Biden, arrive for the Presidential Inaugural Prayer Service at the Washington National Cathedral in Washington, Tuesday, Jan. 22, 2013. The 106-year-old Episcopal church has long hosted presidential inaugural services. (AP Photo/Carolyn Kaster)

US President Barack Obama, First Lady Michelle Obama, Vice President Biden and his wife Dr. Jill Biden attend a prayer service at Washington National Cathedral on January 22, 2013 in Washington, DC. SAUL LOEB/AFP/Getty Images

(Front L-R)US President Barack Obama, First Lady Michelle Obama, Dr. Jill Biden and Vice President Biden applaud the choir as they attend a prayer service at Washington National Cathedral on January 22, 2013 in Washington, DC. SAUL LOEB/AFP/Getty Images

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and his wife Jill Biden, attend the Presidential Inaugural Prayer Service at the Washington National Cathedral in Washington, Tuesday, Jan. 22, 2013. The 106-year-old Episcopal church has long hosted presidential inaugural services., this one following Monday's 57th Presidential Inauguration. (AP Photo/Carolyn Kaster)

The Rev. Adam Hamilton, senior pastor, United Methodist Church of the Resurrection, Leawood, Kansas, speaks as US President Barack Obama, First Lady Michelle Obama, Dr. Jill Biden and Vice President Biden as they attend a prayer service at Washington National Cathedral on January 22, 2013 in Washington, DC. SAUL LOEB/AFP/Getty Images

President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and his wife Jill Biden attend the Presidential Inaugural Prayer Service at the Washington National Cathedral in Washington, Tuesday, Jan. 22, 2013. The 106-year-old Episcopal church has long hosted presidential inaugural services., this one following Monday's 57th Presidential Inauguration. (AP Photo/Carolyn Kaster)

US President Barack Obama(L) and First Lady Michelle Obama arrive to attend a prayer service at Washington National Cathedral on January 22, 2013 in Washington, DC. SAUL LOEB/AFP/Getty Images

Attendees gather around U.S. President Barack Obama (C) and his wife Michelle Obama as they depart following the Presidential Inaugural Prayer Service at the National Cathedral in Washington, January 22, 2013. REUTERS/Jonathan Ernst

People leave the Washington National Cathedral in Washington, Tuesday, Jan. 22, 2013, after the National Prayer Service, attended by President Barack Obama and Vice President Joe Biden, and their spouses. The 106-year-old Episcopal church has long hosted presidential inaugural services., this one following Monday's 57th Presidential Inauguration. (AP Photo/Manuel Balce Ceneta)