Article Photos: Rivals stress differences and bipartisanship hopes 5/13

  President Barack Obama waves as he boards Air Force One before his departure from Andrews Air Force Base, Sunday, Nov. 4, 2012. Just two days from the finish, Obama's campaign is mobilizing a massive get-out-the-vote effort aimed at carrying the Democrat to victory, as Republican Mitt Romney makes a late play for votes in Democratic-leaning Pennsylvania. (AP Photo/Pablo Martinez Monsivais)