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Mr. Gingrich, who has dropped precipitously in polls while under attack by a “super PAC” supporting Mr. Romney, told reporters traveling with him that “Romney called himself a moderate as governor.”

Complaining of being “Romney-boated” — a reference to the group that attacked Senator John Kerry of Massachusetts in 2004, Swift Boat Veterans for Truth — Mr. Gingrich said that by damaging him, the ads had only “guaranteed that some other conservative emerged,” an apparent reference to Mr. Santorum.