U.S. Vice President Joe Biden (L) shakes hands with Republican vice presidential candidate U.S. Rep. Paul Ryan (R-WI) (R) after the vice presidential debate at Centre College October 11, 2012 in Danville, Kentucky. This is the second of four debates during the presidential election season and the only debate between the vice presidential candidates before the closely-contested election November 6.
Students walk past a political mural near Centre College October 11, 2012 in downton Danville, Kentucky. Vice President Joe Biden and Republican vice presidential nominee Rep. Paul Ryan (R-WI) will participate in the one and only vice presidential debate of the election at the college Thursday.
In this image released by the U.S. Navy courtesy of Lockheed Martin, the U.S. Navy variant of the F-35 Joint Strike Fighter, the F-35C, conducts a test flight February 11, 2011 over the Chesapeake Bay.