CNN's Washington bureau chief David Bohrman said CNN is in talks with the campaigns. A spokeswoman says they may consider changing the date. Former Massachusetts Gov. Mitt Romney and New York major Rudy Giuliani had said late last week they would not attend due to scheduling conflicts.

A spokesman for Romney confirmed they have been speaking to Bohrman and may attend if the date could be "pushed back." The Giuliani campaign said it is working with CNN to find a date that would work for everyone.

Sen. John McCain, R-Ariz, former Wisconsin Gov. Tommy Thompson and libertarian Ron Paul had said earlier they would attend the debate.

Conservative bloggers, including former Republican National Committee e-campaign director Patrick Ruffini, http://www.techpresident.com/node/4009) are urging Republican frontrunners to show up for debate in the early primary state. They've also created an online petition. http://www.savethedebate.com/

The Florida primary is Jan. 29.