Trump represents change now, but he will soon become the status quo, and eventually voters will seek a corrective—just as in 2000 they traded an oversexed Rhodes Scholar for a Bible-fearing Texan proud of his anti-intellectualism, who then gave way to a cerebral black man with the middle name “Hussein,” who was then succeeded by the nation’s birther-in-chief. Eventually, Trump’s corrective will emerge. It is Democrats’ responsibility to find that candidate by 2020.