When it comes to abortion, Mitt Romney has conceded a change of heart while trying to minimize criticism by noting that some of his rivals have also flip-flopped on issues.

Last night, the former Massachusetts governor offered another defense, saying he is being unduly criticized for shifting from supporting abortion rights to opposing them.

The Republican presidential contender said he wouldn't endure such questions had he gone from opposing abortion rights to favoring them.

"What I find interesting is, had I been pro-life and then changed to pro-choice, no one would ask the question," he said on Fox News Channel's Hannity and Colmes. "But if you go the other direction, as I have and as Ronald Reagan did and (former Illinois Rep.) Henry Hyde and (former President) George Herbert Walker Bush, it's like the media can't get enough of it: 'Oh, well, why did you change?' "