Newt Gingrich says he regrets endorsing Dede Scozzafava in the hotly contested primary for the NY-23 congressional district in November.

Scozzafava was criticized by many national Republicans for being too liberal. She eventually dropped out of the race and endorsed Democrat Bill Owens, who eeked out a victory.

"She turned out to be a huge disappointment, and she turned out not to be frankly a loyal Republican," Gingrich told an interviewer in New Hampshire this weekend.

The former speaker added that conservatives who criticized his endorsement at the time "had the better of that argument."

Gingrich said he didn't realize how "radical" Scozzafava was when he endorsed her. Conservatives lambasted her for supporting gay marriage and card check, among other liberal positions.

"She had some positions that were far more radical than I realized at the time, and I think in retrospect it was probably a mistake," he said.

Listen to Gingrich's comments below. [H/t GOP 12]