Former House Speaker Newt Gingrich of Georgia is leading former Massachusetts Gov. Mitt Romney in the Republican presidential race by 20 points—41 percent to 21 percent--among self-professed conservatives, according to a new Gallup poll released Thursday. By contrast, Romney is leading Gingrich by 10 points—27 percent to 17 percent—among self-professed liberals and moderates in the poll. The poll, conducted Dec. 5-11, surveyed 1,665 Republicans and Republican-leaning independents who are registered voters. Among all poll respondents, Gingrich led Romney 33 percent to 23 percent, with Rep. Ron Paul of Texas at 9 percent, Rep. Michele Bachmann of Minnesota at 6 percent,...