Ignore the talk about purity tests, progressive cred, and skipping to a post-presidency status. Clinton won’t be denied this time—and she’s going to make history.The non-race for the 2016 Democratic presidential nomination, all but unprecedented in non-incumbent contests, is confounding to journalists and pundits, to the quoteratti whose words sustain their output, and to the partisan spinners whose mission is to bend the arc of the story. But the political cycle—-and the 24-hour news cycle—has its own relentless rhythms. If you’re one of the boys, and now girls, on the bus, even if it hasn’t rolled into Iowa yet, it’s...