Obama leads Romney by a 53-43 margin and Santorum by a virtually identical 53-42 margin. A generic Republican fares slightly better, with Obama winning by a 50-45 margin. Obama has a 53 percent approval rating.

Among Republicans, Santorum is the first choice of 36 percent and Romney is the first choice of 34 percent. 56 percent of Republicans, however, think Romney is the most electable while 28 percent think the same is true for Santorum.