From out of the horses’ mouths. “They have to be able to defend themselves,” Kansas Republican senator Roger Marshall said, of the Iranian Revolutionary Guard Corps’ stockpile of ballistic missiles. Until a couple of weeks ago, Marshall, a MAGA diehard, had been all in on Trump’s war. “You think that Iran needs to be able to defend itself?” his interviewer, CNN anchor Kaitlan Collins, repeated, as if to make sure the cameraman was getting it all on video. “I do,” Marshall insisted. And anyway, short of “a forever war,” he argued, “you’re never gonna get them . . . surrendering everything.” In this, Marshall was only echoing the president’s own line. “Missiles are not the problem,” Trump told another journalist on Wednesday.…