Yet compared to Mr. Trump and Senator Cruz, neither of whom has come close to demonstrating the skills or the temperament to serve as leader of the free world, Mr. Kasich has offered genuine statesmanship — if only by refusing to wallow in the trough of name-calling and extremism that has so captured his opponents. It should come as no surprise that polls have consistently shown that Mr. Kasich has a better chance of winning in November than the vulgarian New York developer with a frighteningly poor grasp of foreign policy or the Princeton debater and preposterous Ronald Reagan poseur with a demonstrated inability to work with others, Democratic or Republican, and who promises more of the same if elected.