Vice President Joseph R. Biden exits a voting booth after casting his ballot at Alexis I. duPont High School in Greenville, Del., on Tuesday, Nov. 6, 2012. (AP Photo/Matt Rourke)

Photo by: Matt Rourke

Vice President Joseph R. Biden exits a voting booth after casting his ballot at Alexis I. duPont High School in Greenville, Del., on Tuesday, Nov. 6, 2012. (AP Photo/Matt Rourke)