A commenter on an old post of mine just referred to John McCain as “Juan McCain.” The nickname, a nasty reference to his previous support for comprehensive immigration reform, turns out be all over conservative message boards. (It’s the McCain equivalent of “Barack Osama/Barack Hussein Osama”, which is still circulating — it was just used on Fox News by a conservative radio host the other day and was mentioned by a Missouri voter interviewed in the New York Times today.)

Update 2/1 10:00 AM: Think Progress flags Glenn Beck and a fill-in host using “Juan McCain” on his radio show and in an email to listeners.