Romney signs marriage pledge - Ben Smith - POLITICO.com Former Massachusetts Gov. Mitt Romney has joined Minnesota Rep. Michele Bachmann and former Sen. Pennsylvania Rick Santorum in signing a pledge to oppose same-sex marriage on a number of specific fronts. The three candidates signed the pledge advanced by the National Organization for Marriage, which has led national and state campaigns to limit marriage to a man and a woman. The signature of the front-runner, Romney, is a bit of a coup for the group, as he's been careful about committing to other pledges, including a broad promise to a socially conservative Iowa group that caused trouble for other candidates. Romney, Bachmann and Santorum signed on to support a federal constitutional amendment defining marriage, to appoint federal judges who don't see a constitutional right to same-sex marriage and to back the Defense of Marriage Act.