Republican voters have sent lots of politicians to Washington who promise to get tough on border control and wind up supporting amnesty within about 35 minutes of their arrival. Marco Rubio, come on down! (Also Renee Ellmers and, um, Eric Cantor.) It’s all too realistic to expect that Scott Walker and even Ted Cruz will join these Election Day converts to comprehensivism, should either win national office. But this Trump guy — he’s out of control! He means business. He might actually build the danged fence.

This is also why Trump will likely be punished if he backpedals and apologizes for his wild overstatements disparaging Mexican illegals. It would have been easy for Trump to say he spoke imprecisely — ‘the vast majority of Mexican illegal immigrants are good people, but we’re getting a lot of bad people too, etc.’ [which I believe to be the truth***]. Talk more about the effect even law-abiding undocumented workers have on wages. He hasn’t done that. He knows voters regard his behavior as a sort of trial run for how fast he’d cave in office.