Frankly I doubt it's going to happen for the latter reason - the Obama team consists sufficiently of Clinton retreads who have learned the mores of that weird little micro-environment and what happens when they start to eat their own. Clinton's two biggest early mistakes were provoking the more or less nonpartisan D.C. infrastructure in Travelgate and provoking the overt partisan insiders of both parties by filching their FBI files in Filegate. The result was the weakening of the protection that those relationships afford. They were still running interference for him, of course (it's where we got "moveon.org") but not enough to prevent impeachment.
But the real radicals own a lot of microphones and are demanding loudly that a current Democrat majority in Congress that has been unable to accomplish anything else, cut out their pound of flesh for them, and it really doesn't matter much whose. Seasoned politicans know enough to run a cost/benefit analysis on such an action and it seems to me, at least, that it's not even close. That's not to say it couldn't happen - Pelosi and Reid are certainly stupid enough to ignore the warnings - but if it does they're very likely to be given the heave-ho by their own team. That's not quite what is meant by "civil war" but it isn't a bad working description of D.C.
Yeah gorilla warfare and asymmetrical warfare could be undertaken and passive resistance could also be tried but you'll be looking at decades of violence. Then again while we were at each other's folks, China could just slip in and occupy our Pacific coast and Alaska...