For one, if it was not clear before, Cruz is making himself entirely unacceptable to all but “very conservative†Republicans. Moreover, he is making himself noncompetitive in a general election context. Even before this latest spasm of extremism, Cruz does worse against Hillary Clinton than do all the other GOP candidates, except Trump. Combined with his vehement opposition to gay marriage (even advocating election of Supreme Court justices, as if that would improve his chances of reversing the court’s ruling), opposition to abortion even in cases of rape and incest, his leadership in the government shutdown and the absence of...