Appearing on "The Tonight Show with Jay Leno" on Tuesday, Ann Romney claimed that she vowed in 2008 to never join a presidential campaign again, but Mitt convinced her anyway.

"Four years ago I made a video tape," she said. "On the video tape, I looked into the camera and I said, 'Mitt, this is for you, sweetheart. I'm never doing this again.' I showed it to him and he looked at it and he said, 'You know, Ann, you say that after ever pregnancy.' Which is true."

Ann and Mitt Romney have five boys. Ann said that after the fifth, she was sure that's quite enough. "In those days, I never knew what sex the child was going to be," she said.

As for the difference between 2008 and 2012, Romney said she's "100 percent committed" this time around.

"I feel very strongly," she said. "I feel as though Mitt really does have the skills and qualifications to turn this economy around. There's 23 million Americans who are really hurting out there, especially women who've been hit especially hard. More women are slipping into poverty."

But she said she was most encouraged by her husband's belief that "it's not too late" to save America. "Mitt said it's growing late, it's not too late yet," Romney said. "That's all I need to know. You're the guy. You can do it. I believe in you. I know you do not, you will not fail. You're gonna help Americans. Go do it."

Her first appearance on Leno wasn't the first time Romney has said actually pretty much all of those exact things. Since the Republican National Convention in Tampa, her primary job on the campaign trail has been to "humanize" Mitt. The Romney campaign, however, has resisted placing her in the limelight all that often. In secretly filmed comments to a group of big donors, Romney explained that he wanted to use his wife "sparingly right now so that people don't get tired of her."

This video is from "The Tonight Show with Jay Leno," broadcast Tuesday, Sept. 25, 2012.

Part one:

Part two: