(9:54 p.m.)

Presidential aspirant and bass guitar player Mike Huckabee followed in the footsteps of several famous country music starts like Tim McGraw, recording a tune at Curb Records studio in Nashville, Tenn.Appearing with Huckabee: Country music legend Ricky Skaggs and rising star Josh Turner.

The musical team played "Mustang Sally," "Sweet Home Alabama" and Taking Care of Business.

(4:54 p.m. ET)

The McCain campaign denied it has anything to do with Spanish-language "robocalls" against Mitt Romney in the Miami area.

Al Cardenas, Romney's Florida campaign chairman, told reporters that supporters called in to let them in on the calls. They haven't been able to obtain a taped copy yet.

"The calls are accusing Governor Romney of favoring opening up relations with Castro's Cuba," Cardenas said. On Sunday, Romney discussed with Cuban-Americans the harmful impact Fidel Castro had caused his own country.

Asked who Romney's camp was eyeing as the source of the negative phone calls, Cardenas responded, "Obviously it is a camp of one of (Romney's) opponents. Most callers calling in believe it is. I don't yet have the specific information to make that statement, but we are working on it. "

-- Dispatch from FOX News' Shushannah Walshe.

(2 p.m.ET)

If you didn't think John McCain and Mitt Romney could be any closer in the polls, think again.

In the second poll of the day to look at the Florida GOP primary, Rasmussen Reports shows Romney and McCain in a dead heat -- tied at 31 percent -- leading into Tuesday's vote in The Sunshine State.

The poll authors note that the numbers follow the weekend endorsement of McCain by popular Florida Gov. Charlie Crist, which could explain why the Arizona senator's poll numbers jumped 4 percentage points from a day earlier.

The poll showed downward trends for Romney and Rudy Giuliani.

Giuliani pulled 16 percent of the Rasmussen poll, and former Arkansas Gov. Mike Huckabee received 11 percent, following the same order as the Quinnipiac poll also released Monday (See below).

Other notes from Rasmussen: Both McCain and Romney's supporters seem pretty strongly committed, with 79 percent saying they either have already cast early votes for their candidate or are sure they won't change their mind. Only 2 percent of all polled are undecided; 6 percent say there's a good chance they could change their mind

Rasmussen's poll surveyed 578 likely Republican primary voters on Jan. 27 with a margin of error of 4 percent.

Click here to see the full results of the Rasmussen Reports poll.

(9 a.m. ET)

Mitt Romney and John McCain are virtually tied for the lead in a new poll of Florida voters and they are well ahead of Rudy Giuliani -- who is banking on winning in The Sunshine State to win the GOP nomination.

The latest Quinnipiac University poll shows McCain with 32 percent, Romney with 31 percent -- within the poll's 4.1 percent margin of error. Giuliani trails with 14 percent, and Mike Huckabee follows soon after with 13 percent.

The poll shows depleting support for Rudy Giuliani and surging support for Romney since the last time it looked at Florida on Jan. 14, when McCain held 22 percent of the poll; Giuliani, 20 percent; and Romney and Huckabee tied for 19 percent.

The Jan. 24-27 poll surveyed 585 likely Republican voters.

The poll also looked at the Democratic field, which has become more in focus in the hours since Barack Obama won Saturday's South Carolina primary contest. While the Democratic contenders all pledged not to campaign in the state, Hillary Clinton has scheduled some events there that -- while officially are not campaign events, but fundraisers -- but still puts her on the map there in an attempt to shore up sorely needed support.

In Florida, Clinton is holding onto a solid margin over Obama. Of those polled, 50 percent said they would pick Clinton, 30 percent said they would pick Obama; 12 percent said they would choose Edwards.

The Democratic survey quizzed 481 likely voters and had a 4.5 percent margin of error.

Click here to see the Quinnipiac U. Florida poll results.