Rick Santorum is about to see the kitchen sink up-close. So far he hasn’t been a threat, so he hasn’t faced much harsh scrutiny, much less the attacks that are about to come his way. His candidacy is for real, and Newt Gingrich and Mitt Romney both know it. While Gingrich thought he could isolate Romney and become his lone real competitor, yesterday’s results, combined with a deflating Gingrich campaign, have allowed Santorum to leapfrog Gingrich as the more viable Romney alternative today. It’s not in Gingrich’s nature to give up. Attacking Romney hasn’t gotten him to where he thought...