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After fourth-place finish, Gingrich congratulates Santorum, slams Romney

Newt Gingrich is projected to finish fourth in the Iowa caucuses, but he said Tuesday night his fight will go on.

"We are at the beginning of a great campaign," Gingrich told supporters and said a "new battle begins" after Iowa.

The enemy in Gingrich's "new battle" appears to be Mitt Romney, who edged out Rick Santorum for first place in Iowa.

Without mentioning Romney by name, Gingrich slammed the "Massachusetts moderate" for his policies and for running negative ads against him.

"I admire how positive [Santorum] was," Gingrich said. "I wish I could say that about all the candidates."

Since vaulting to front-runner status in numerous polls in December, Gingrich has faced withering attacks from the former Massachusetts governor and Rep. Ron Paul (Texas). Political action committees backing those candidates have blanketed Iowa with ads attacking him.

"We survived the biggest onslaught in the history of the Iowa primary," Gingrich said.

He said he would continue to run a positive campaign, but "I reserve the right to tell the truth."

"On to New Hampshire," he concluded.