WASHINGTON--Ron Paul, Newt Gingrich, Mitt Romney and Rick Santorum debate for the last time before the Jan. 31 Florida primary at 8 p.m. est on CNN, moderated by Wolf Blitzer

The debate at the University of North Florida in Jacksonville is hosted byCNN, the Republican Party of Florida and the Hispanic Leadership Network.

Polling show Gingrich ahead or in a tie with Romney. From CNN: "The CNN-Time-ORC International poll released Wednesday indicated that 36% of people likely to vote in Tuesday's Florida primary back Romney, while 34% are for Gingrich. Romney's margin is well within the survey's sampling error. The poll had Santorum at 11% and Paul at 9%, with 7% undecided."