Yep, I've been calling them copperheads for a couple years now - of course, given the state of the liberal education system in this country, I'm usually the only one around who knows what I'm talking about.
(see my tagline)
If you haven't already, I highly recommend Doris Kerns Goodwin's latest book, "Team of Rivals." It's amazing how much alike are the leadership styles of Lincoln and President Bush.