President Barack Obama and Baltimore Ravens head coach John Harbaugh, center, hold a Baltimore Ravens football jersey presented to the president during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the Super Bowl XLVII champs. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. General Manager Ozzie Newsome is at right. (AP Photo/Evan Vucci)

President Barack Obama welcomes the NFL champion Baltimore Ravens football team to the South Lawn of the White House in Washington, Wednesday, June 5, 2013. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

President Barack Obama gestures as he welcomes the Super Bowl XLVII champion Baltimore Ravens football team to the South Lawn of the White House in Washington, Wednesday, June 5, 2013. From left are: retired linebacker Ray Lewis; safety Ed Reed, now with the Houston Texas; running back Ray Rice, team President Richard W. Cass, the president, and head coach John Harbaugh. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

President Barack Obama shakes hands with former Baltimore Raven safety Ed Reed, now with the Houston Texans, right, as retired linebacker Ray Lewis, center, and others, watch during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the NFL champion Baltimore Ravens. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII.. (AP Photo/Evan Vucci)

With the Vince Lombardi Super Bowl trophy in the foreground, President Barack Obama speaks on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, during a ceremony honoring the Super Bowl XLVII champion Baltimore Ravens football team. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Evan Vucci)

President Barack Obama holds a Baltimore Ravens football jersey with head coach John Harbaugh, second from right, during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the Super Bowl XLVII champs. Front row, from left are, retired linebacker Ray Lewis, former safety Ed Reed, running back Ray Rice, team President Richard W. Cass, the president and Harbaugh.(AP Photo/Charles Dharapak)

President Barack Obama hugs retired Baltimore Ravens linebacker Ray Lewis during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the Super Bowl XLVII Super Bowl champions. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Evan Vucci)

President Barack Obama poses with a personalized Baltimore Ravens football jersey with head coach John Harbaugh during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the Super Bowl XLVII champs. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

Retired Baltimore Ravens football linebacker Ray Lewis, center, laughs as President Barack Obama is presented with a personalized team jersey during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the Super Bowl XLVII champs. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Evan Vucci)

Former Baltimore Ravens linebacker Ray Lewis, left, and Ed Reed, center, shake hands after arriving on the South Lawn of the White House to be honored by President Barack Obama on Wednesday, June 5, 2013, in Washington. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. At right is Ravens running back Ray Rice. (AP Photo/Evan Vucci)

President Barack Obama gestures towards former Baltimore Ravens football linebacker O.J. Brigance, in wheelchair, right, during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where the president honored the Super Bowl XLVII champs. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. Brigance, currently Ravens? senior adviser to player development, has been fighting Lou Gehrig?s Disease (Amyotrophic Lateral Sclerosis) the past five-plus years. (AP Photo/Charles Dharapak)

President Barack Obama receives a shirt from Baltimore Ravens football General Manager Ozzie Newsome, right, as he welcomes the Super Bowl XLVII Super Bowls champions during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013. From left are: retired linebacker Ray Lewis; safety Ed Reed, now with the Houston Texans; running back Ray Rice, team President Richard W. Cass and Newsome. .The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

Baltimore Ravens football wide receiver Torrey Smith, right, shows off his new haircut to Rep. Elijah Cummings, D-Md., after a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, where President Barack Obama honored the Super Bowl XLVII camps. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Evan Vucci)

President Barack Obama hugs Ed Reed as he welcomes the NFL champion Baltimore Ravens football team to the South Lawn of the White House in Washington, Wednesday, June 5, 2013. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

President Barack Obama greets retired Baltimore Ravens football linebacker Ray Lewis, center, during a ceremony on the South Lawn of the White House in Washington, Wednesday, June 5, 2013, to honor the Super Bowl XLVII champs. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Evan Vucci)

President Barack Obama welcomes the NFL champion Baltimore Ravens football team to the South Lawn of the White House in Washington, Wednesday, June 5, 2013. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

President Barack Obama poses with a team jersey with head coach John Harbaugh as he welcomes the NFL champion Baltimore Ravens football team to the South Lawn of the White House in Washington, Wednesday, June 5, 2013. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

President Barack Obama shakes hands with quarterback Joe Flacco, center, as he welcomes the NFL champion Baltimore Ravens football team to the South Lawn of the White House in Washington, Wednesday, June 5, 2013. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Charles Dharapak)

President Barack Obama, right, walks with Baltimore Ravens head coach John Harbaugh, left, and general manager Ozzy Newsome before a ceremony to welcome the NFL champion Baltimore Ravens football team to the South Lawn of the White House on Wednesday, June 5, 2013, in Washington. The Ravens defeated the San Francisco 49ers in Super Bowl XLVII. (AP Photo/Evan Vucci)