FILE - In this July 27, 2011, file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney speaks in the warehouse at Screen Machine Industries during a campaign stop in Pataskala, Ohio. Same-sex marriage might seem like a straightforward issue: You're for it or against it. Yet for the field of Republican presidential hopefuls, it's proving to be an awkward topic as public attitudes change and more states legalize gay unions, the latest being New York.  Romney and Tim Pawlenty were among those refusing to sign the pledge, but both issued statements stressing that they favored limiting marriage to one-man, one-woman unions. (AP Photo/Jay LaPrete) (AP)