Kristof: Here’s where Trump is unrivaled

President Donald Trump is unrivaled in American history in one respect: None of his predecessors ever cashed in on the presidency as he has. The Teapot Dome scandal under Warren Harding? Richard Nixon’s slush funds during Watergate? Those seem like junior high school by comparison with the present culture of corruption. The fire hose of disclosures has been overwhelming. A New York Times editorial estimated conservatively that the Trump family has made more than $1.4 billion in documented gains by exploiting the second term of his presidency. (Others offer higher figures.) And all that pales beside the latest bombshell: a…