A new Pew poll of Republican and Republican-leaning registered voters finds Rick Santorum with a slight lead over Mitt Romney in the GOP presidential race, 30 percent to 28 percent. Seventeen percent support Newt Gingrich, and 12 percent support Ron Paul. The poll was conducted between February 8 and February 12, after Santorum’s sweep in the Missouri primary and the Minnesota and Colorado caucuses last Tuesday.