In this Feb. 1, 2012, file photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney talks to reporters on his campaign plane en route from Tampa, Fla. to Minnesota and Nevada. Romney faces a daunting to-do list as he transitions into the role of likely Republican presidential nominee: raise more money, hire more people to work states critical in the fall race, hone his message for broad-spectrum appeal, while fending off GOP challengers who refuse to quit, thinking about a running mate, and refining a strategy to win the 270 electoral votes needed for the White House. (AP Photo/Gerald Herbert, File)