RINO UPDATE: Romney Signs Pro-Straight Marriage Pledge w Tea Party Supporter Bachmann Former Massachusetts Gov. Mitt Romney, Rep. Michele Bachmann (R., Minn.) and former U.S. Sen. Rick Santorum have signed a pledge from the National Organization for Marriage to oppose gay marriage at several levels of the federal government. But former Minnesota Gov. Tim Pawlenty, who has sought to burnish his credentials as an evangelical Christian, declined to sign it, possibly putting him at odds with the social conservatives he is trying to court in Iowa. The National Organization for Marriage is running a four-day Iowa bus tour leading up to the Aug. 13 straw poll in Ames.