Mistakes happen on the campaign trail. Any politician in the national spotlight is bound to make one or two. The mark of a truly skilled politician, however, is one who can take their lumps, adapt, move on, and rebound from that error. Texas Democratic gubernatorial candidate Wendy Davis is not a skilled politician. Davis’s much maligned “wheelchair ad,” in which she criticizes Republican gubernatorial candidate Greg Abbott’s position on tort reform while unsubtly drawing the audience’s attention to his disability, was a mistake. It drew criticism from both the right and the left, and a competent campaign would have pulled...