The era of Maury-Povich politics is officially upon us, after President Donald Trump suggested at a rally in Montana last week that Senator Elizabeth Warren be subjected to a DNA test. “I shouldn’t tell you ’cause I like not to give away secrets… Let’s say I’m debating Pocahontas,” the president said, reviving his favorite racist nickname for the senator. “You know those little kits they sell on television for $2…I’m gonna get one of those little kits and in the middle of the debate, when she proclaims that she’s of Indian heritage, because her mother says she has high cheekbones…we...