Sanders supporters are about as "internationalist" as Clinton supporters; one could argue that they are more passionately "internationalist" where it actually accounts. It's one thing to question the merit of free trade and it's quite another to support subjecting immigrants from the Middle East to an all-encompassing police state...
It's a little bit of a relief that Trump supporters (outside of this forum) aren't much crazier about universal health care than Cruz supporters (and less so than Kasich supporters. Perhaps small-government conservatism will prove to be a stronger force within the GOP than many here are predicting.