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FILE - In this Aug. 30, 2012 file photo, Republican presidential candidate Mitt Romney and vice presidential candidate Paul Ryan are on stage with their wives Ann Romney and Janna Ryan at the end of the Republican National Convention in Tampa, Fla. Message to convention planners: Three days are enough. Both major parties packed their presidential nominating conventions into 72 hours, one day short of the traditional four-day celebration _ prompting few complaints from either delegates or the viewing public. (AP Photo/Jae C. Hong, File)

Mitt Romney

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