Carter's grandfather, Jimmy Carter, bragged about his grandson's efforts in a separate interview on CNN's "Piers Morgan Tonight."
The former president said he thought the video was a "pivotal moment" in the election.
"It was something (Romney) could not deny and it stuck with him for the rest of the election and I think it was a major factor, if not the major factor," he said.
"Carter won Obama the election," Morgan joked.
"I think so," Carter said, laughing.