Gallup poll: former speaker leading Romney by 15 points

Newt Gingrich holds a 15 point advantage over Mitt Romney in the race for the GOP presidential nomination, according to a new national survey of registered Republicans. Thirty-seven percent questioned in Gallup's inaugural daily tracking poll this cycle say they are likely to support the former House speaker for the GOP nomination, with 22% backing the former Massachusetts governor.  Gingrich's numbers have surged dramatically from Gallup's last poll in mid-November, in which the former House Speaker was only leading Romney by a single percentage point.

Carol Costello speaks with CNN senior political analyst Ron Brownstein and Erick Ericson, editor-in-chief of Redstate.com, to discuss what Gingrich needs to keep the pressure on Romney.