Rick Santorum’s front-runner status in the GOP presidential race is predicated on the idea that he is the consistent conservative alternative in the field. And that image had some serious holes poked in it at Wednesday’s debate in Arizona. Mitt Romney and Ron Paul tag-teamed the former Pennsylvania senator much of the night, calling into question his conservatism on issues ranging from earmarks and fiscal policy to his endorsements and even what is often considered Santorum’s most solidly conservative credential — social issues.