FILE - In this June 4, 2012 file photo, President Barack Obama and former President Bill Clinton wave to the crowd during a campaign event at the New Amsterdam Theater in New York. Clin

 

              FILE - In this June 4, 2012 file photo, President Barack Obama and former President Bill Clinton wave to the crowd during a campaign event at the New Amsterdam Theater in New York. Clin
FILE - In this June 4, 2012 file photo, President Barack Obama and former President Bill Clinton wave to the crowd during a campaign event at the New Amsterdam Theater in New York. Clinton will have a marquee role in this summer's Democratic National Convention, where he will make a forceful case for Obama's re-election and his economic vision for the country, several Obama campaign and Democratic party officials said Sunday, July 29, 2012. (AP Photo/Carolyn Kaster, File)