I've been saying, since Gravel first blipped on my political radar, back in April of '06, when he became the first person of either major party to throw his hat into the 2008 ring, that I thought he might really lean more toward Libertarian than Democrat.
I got a heads-up, earlier today, that Mike Gravel is indeed officially switching parties from Democratic to Libertarian and will be making an announcement to that effect, today. (He may have already made it, by now.)
Not a big surprise. Left socially, Right economically... I think the Libertarian party will be a better fit for him.
So long and thanks for all the sales in my shops, Mike. (Curiously, to date, Gravel merch has far outsold Barack and Hillary merch, put together, in my shops.)