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Differences -- Abortion right away

From NBC's Domenico Montanaro
DES MOINES -- Stephanopoulos went right at abortion. Brownback has been attacking his opponents with calls and mailers to potential voters in Iowa and ABC played his robo call accusing Romney of being pro-choice.

Romney responded saying, "Virtually nothing in that ad is true. ... I am pro-life and that's the truth." He described the ad as "desperate."

Stephanopoulos tried to intervene and get him to say precisely what is untrue in the ad.

"Virtually every part of that ad is inaccurate," Romney responded, adding the he has always opposed tax-funded abortions. "The ad is completely wrong."

Brownback said go on YouTube video to see Romney's 1994 comments during his Massachusetts Senate run.  "I was pro-choice, I am pro-life. I changed my position. When the first time a bill came to my desk, I came down on the side of life. I am getting tired of people are holier than thou because they've been pro-life longer than I have."