Sullivan: The Left's Border Conflict

Just wanted to make sure to point to the second section of Sullivan's Friday essay.
Yes, the left is moving ever closer to an open borders position. (Has anybody forgotten that I've been saying that for years? And that I got ridiculed for it? Because I don't want anybody to forget...)
Also of interest:
How about this argument, huh?:

A: Let's have open borders!
B: That's a Koch brothers position!

Some refutation, that.
NBD. Just funny.
Bernie's second argument is, of course, his real one: it would make the U.S. poorer.
Though my view is: even if it made us richer, we shouldn't do it.