All I can find is this one opinion piece by Mark Krikorian, with no sourcing, making this claim about the “Defender of the Melting Pot Award”. It has then been picked up by everyone else. I’m always dubious of folks who don’t provide citations.
http://article.nationalreview.com/?q=ZmI3NzU5OTc4ZjdiZDgxNDdjNTkzZmM0MjExZmE2NGE=
See post# 59.