In this June 8, 2012, photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney smiles has he talks with his staff while riding on his bus after a campaign stop in Council Bluffs, Iowa. Republicans riding high from a string of breaks in their favor are increasingly optimistic about Romney's chances to claim the White House in November, even among conservatives who had qualms about making him the party's nominee. The bullish take is reflected in interviews with party strategists and activists, including people who supported Romney rivals during the primary season. Mood matters because it can fuel fundraising and volunteer hustle. But some of those GOP players stress that Romney has little room for error if he expects to topple an incumbent president. (AP Photo/Evan Vucci)