I’d been struggling over the weekend to come up with a proper definition of the expression “sitting duck” for my daughter Emilie. Had Meghan’s performance come to my attention earlier it could have served as a perfect example. You can’t, after all, go on national TV, all perky and blonde and blushing and young, and endowed with a soapbox years before you’ve paid your dues and, while talking about how Republicans should reposition themselves on sex, say, “I would never wanna practice anything I didn’t preach.” Even with the best of intentions. You can’t do these things because they’re just...