Why Romney? Such folks are usually younger, unmarried, and relatively irreligious.
Are you sure? Those things first became "a thing" sometime in the '90s so many of the guys who have them are now pushing or past 40. I see plenty of married-with-kids conservative, megachurch types with such tattoos, or with cross tattoos or Bible verse references, which is ironic given that the Bible specifically tells people not to tattoo their flesh.
I'm going to say Romney because the ones who'd be more predisposed to vote Democratic probably didn't vote at all.