Republican presidential candidate Mitt Romney acknowledges his supporters before delivering his acceptance speech at the Tampa Bay Times Forum in Tampa, Florida, on August 30, 2012 on the final day of the Republican National Convention (RNC). The RNC culminates today with the formal nomination of Mitt Romney and Paul Ryan as the GOP presidential and vice-presidential candidates in the US presidential election. AFP PHOTO Robyn BECK (Photo credit should read ROBYN BECK/AFP/GettyImages)