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Still, he didn’t let up on what have been around-the-clock negative assaults against Mr. Gingrich ever since Mr. Gingrich stunned him with a victory in the Palmetto State primary. Mr. Romney poked fun at Mr. Gingrich’s last two poorly reviewed debate performances and said that it is “sad” to watch the Georgia Republican search for ways to take down Mr. Romney.

“He has been flailing around a bit trying to go after me for one thing or the other, and you just watch and shake your head. It has kind of been painfully revealing to watch,” he said.

Mr. Gingrich, he said, is crumbling under the weight of poor debate performances and the stories of the $1.6 million he made doing “consulting work” on behalf of Freddie Mac — the government-backed mortgage giant that many people say contributed to the housing crash that has decimated Florida’s housing market.

“[He] made money from Freddie Mac, the very institution that helped stand behind the huge housing crises here in Florida,” the Republican front-runner said, standing alongside Rep. Connie Mack and Pam Bondi, the state’s attorney general. “If you are part of the housing crisis, you are probably not going to get elected president.”

The Romney camp also issued a press release that said that there is “no denying” that Mr. Gingrich “advocated for the Obamacare mandate” to buy health insurance under the president’s health care plan. They pointed reporters to an audio recording from a May 2009 conference call in which Mr. Gingrich speaks in favor of a federal health care mandate.

“We believe that there should be ‘must carry’ that is, everybody should either have health insurance, or if you’re an absolute libertarian, we would allow you to post a bond, but we would not allow people to be free riders, failing to insure themselves and then showing up at the emergency room with no means of payment,” Mr. Gingrich said.

Mr. Romney has faced fire for an individual-mandate provision to purchase health insurance included in the overhaul he signed as governor of Massachusetts.