I'm surprised that Don Boudreaux is apparently unaware that among the best-known opponents of open borders are (or were) the late, great Milton Friedman, Gary Becker, and Thomas Sowell, all of whom are certainly considered to be at least in the beltway libertarian category with regard to their economic theorizing (although Sowell has lately turned into a warmongering neocon of the worst sort).
It's not a very good debate tactic to pretend that your most prominet opponents don't exist.
