Article Photos: Rivals stress differences and bipartisanship hopes 2/13

  President Barack Obama, left, is joined by former President Bill Clinton, right, and Democratic candidate for the U.S. Senate from Virginia, former Gov. Tim Kaine, center, on stage at a rally at Jiffy Lube Live arena, late Saturday night, Nov. 3, 2012, in Bristow, Va. (AP Photo/Pablo Martinez Monsivais)