Both men planned to finish the weekend with urgent rallies across the state. "I don't know how you debate a person," Mr. Gingrich said on the "Fox News Sunday" program, "when he stands there and blatantly just doesn't tell the truth." Mr. Gingrich also renewed his complaints about what he said was Mr. Romney's barrage of negative attacks, financed by what Mr. Gingrich said were wealthy backers from Wall Street and Goldman Sachs. "He has a basic policy of carpet-bombing his opponents," Mr. Gingrich said, conceding that he faced a "very tough campaign" in Florida. Speaking on the ABC News program "This Week," Mr. Gingrich said that "the conservatives are clearly rejecting Romney," and he promised that "this is going to go on all the way to the convention." He elaborated on that theme later in a press conference in Lutz, a Tampa suburb, saying, "Romney's got a very real challenge in trying to get a majority at the convention." A survey released on Saturday night by The Tampa Bay Times and several other Florida news organizations found Mr. Romney ahead, 42 percent to 31 percent. (The telephone survey of 500 registered voters likely to vote in the Florida Republican primary was conducted Tuesday through Thursday by Mason Dixon Polling and Research. The margin of sampling error is plus or minus 5 percentage points.) And an NBC/Marist poll released on Sunday morning showed Mr. Romney ahead by even more, 42 percent to 27 percent. Rick Santorum, who left the state to be with his ill 3-year-old daughter, is in third place in the NBC/Marist poll, with 18 percent of the vote. Mr. Romney appeared to taunt his main opponent at a campaign stop in Naples, suggesting that Mr. Gingrich has only himself to blame if he loses Florida. The surge for Mr. Romney comes even as Mr. Gingrich is broadcasting his own commercials attacking Mr. Romney's integrity. A "super PAC" backing Mr. Gingrich also unveiled an advertisement titled "Blood Money" that accused Mr. Romney of improprieties as a board member of a health care company in Florida. In a statement, Mr. Romney's campaign said the super PAC ad "would make Michael Moore proud, and have already struck a chord with President Obama's liberal allies. They have been thoroughly discredited by independent fact-checkers. In the interview, Mr. Gingrich said his own campaign "resembles nothing that has ever been run. It's very idea- oriented, Internet-based, constantly evolving. Having picked up the endorsement on Saturday of Herman Cain, the former chairman of the Godfather's Pizza chain, Mr. Gingrich on Sunday again claimed the mantle as the choice of conservatives. "We're seeing the conservative movement start to come together," he said on "Fox News Sunday." I think it's going to be very close. "You've got to rage against the machine at this point in order to defend our republic and save what is good and secure and prosperous about our nation," Ms. Palin said Saturday on "Justice With Jeanine," a Fox News program.