Mitt Romney continues racking up delegates — 568 thus far, about half of the 1,144 needed to clinch the Republican nomination. He continues racking up endorsements, with establishment figures like George H.W. Bush and tea party favorites Marco Rubio and Paul Ryan giving him their support last week. And with a huge financial and organizational advantage over his three remaining GOP competitors, he should continue to accumulate delegates where they are awarded proportionally by district or state, even when he loses. By the time the Texas primary rolls around on May 29, there’s a good chance he’ll have the finish...