President Barack Obama walks on the South Lawn of the White House Tuesday, June 12, 2012, leaving for campaign stops in Baltimore and Philadelphia. (AP Photo/Manuel Balce Ceneta)

Associated Press
President Barack Obama walks on the South Lawn of the White House Tuesday, June 12, 2012, leaving for campaign stops in Baltimore and Philadelphia.  (AP Photo/Manuel Balce Ceneta)
President Barack Obama walks on the South Lawn of the White House Tuesday, June 12, 2012, leaving for campaign stops in Baltimore and Philadelphia. (AP Photo/Manuel Balce Ceneta)
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