Like, oh, say . . . this one? It’s hard to get to the left of Barack Obama on immigration, but one thing I guess you’d have to say for Hillary Clinton is that she’s quite agile when it comes to policy positions. What difference, at this point, does it make if she once favored a trade deal? Now she opposes it. Or voted to authorize a war? She’s now against it. Or thinks rape victims should be believed, since, uh, yeah, about that . . . Hillary’s position on anything depends on the day, on the poll numbers and...