Mitt Romney, shown with his wife, Ann, says he would back any Republican nominee challenging President Obama - including Texas Rep. Ron Paul. Fellow Republican challenger Newt Gingrich said he felt he could not support Mr. Paul. Mrs. Romney confirmed reports that she was the one who had to talk her husband into running for president again. (Associated Press)

Mitt Romney, shown with his wife, Ann, says he would back any Republican nominee challenging President Obama - including Texas Rep. Ron Paul. Fellow Republican challenger Newt Gingrich said he felt he could not support Mr. Paul. Mrs. Romney confirmed reports that she was the one who had to talk her husband into running for president again. (Associated Press)