In a new NBC/WSJ poll, Newt Gingrich leads at 37 percent, followed by Mitt Romney (28 percent), Rick Santorum (18 percent), and Ron Paul (12 percent). In general election match-ups, Obama vs. Romney is 49 percent to 43 percent, Obama vs. Gingrich is 55 percent to 37 percent, and Obama vs. Santorum is 53 percent to 38 percent.