Donald Trump came to The Late Show with Stephen Colbert on Tuesday night, and the host got steamrolled, just like pretty much everyone who has tried to crack the Yakking Enigma That Is Trump ever since he announced his candidacy for President. Colbert tried flattery (“You’re the leader!” — of the polls, that is), abjectness (“I apologize,” he said, for mean things he’s said about Trump in the past, inviting Trump to apologize to someone, anyone, to no avail), and tossed him a softball question Colbert called a “meatball” (“Barack Obama — born in the United States?”). Trump, however, wasn’t...