Mitt Romney

Associated Press
FILE - Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, shakes hands with U.S. Rep. Paul Ryan, R-Wis., Chairman of the House Budget Committee, right, before speaking with supporters of Wisconsin Republican Gov. Scott Walker at a phone bank during a campaign stop in Fitchburg, Wis., in this March 31, 2012 file photo. Romney has picked Wisconsin congressman Paul Ryan to be his running mate, according to a Republican with knowledge of the development. The newly minted GOP ticket will appear together Saturday in Norfolk, Va., at the start of a four-state bus tour to introduce the GOP ticket to the nation.  (AP Photo/Steven Senne, File)

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Highlights from Republican presidential nominee Mitt Romney's 2012 campaign trail.

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