Republican U.S. Presidential candidate Mitt Romney (L) introduces Congressman Paul Ryan (R-WI) as his vice-presidential running mate during a campaign event at the retired battleship USS Wisconsin in Norfolk, Virginia, August 11, 2012.
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, and vice presidential candidate Wisconsin Rep. Paul Ryan, R-Wis., wave at the crowd during a campaign event, Aug. 11, 2012 in Norfolk, Va.
Paul Ryan addresses the crowd, Aug. 11, 2012, during a campaign event with Republican presidential candidate, Mitt Romney, not shown, in Norfolk, Va.
Paul Ryan, and his family, and Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his family, partially visible at center back, wave to the crowd, Aug. 11, 2012, in Norfolk, Va.