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“This is a man whose staff created the PAC; his millionaire friends fund the PAC; he pretends he has nothing to do with the PAC. It’s baloney. He’s not telling the American people the truth. It’s just like his pretense that he’s a conservative,” he said.

Mr. Gingrich also is running a full-page newspaper ad in the Manchester Union Leader, the state’s largest paper, that portrays Mr. Romney as a “timid Massachusetts moderate.”

Ryan Williams, a Romney spokesman in New Hampshire, said his boss has shrugged off Mr. Gingrich’s comments. He said the campaign’s focus is on turning out its supporters in all the early-contest states, including in New Hampshire, where Mr. McCain torpedoed Mr. Romney’s chances of becoming the party’s presidential nominee with his come-from-behind victory in the 2008 primary.

Mr. Williams said the campaign has been able to build on the infrastructure leftover from the campaign four years ago and has developed a “ground game in New Hampshire that is second to none.”

The scene was much quieter earlier in the day at the Santorum campaign headquarters in nearby Bedford, where Nick Pappas, the campaign’s field director, said about 20 volunteers were knocking on doors and others were planting campaign signs in the ground “before the ground freezes.”

Surrounded by maps of New Hampshire and Iowa, Mr. Cahill, a senior adviser to the Santorum campaign, said his candidate, who also has chalked up 150 events in the Granite State, has a full schedule over the next week.

“He’s not going to South Carolina, and there is a reason for that,” he said. “He has a lot of time and resources invested in this operation here in New Hampshire. Why would he spend all the time and all the resources and all the good will doing all the work he has done here in New Hampshire and just blow it off?

“Maybe for some it’s a good political calculation, to do a drive-by day in New Hampshire and go on to Spartanburg,” he said. “But that’s not what Rick Santorum’s going to do. He’s going to build on his momentum.”