In any such revolution it is likely at least 1/3 of Americans would be on the side of the government, not to mention most of the police, cops, etc. Since the government in power would presumably be such by winning an election, its supporters might be a considerable majority.
"Winning" such a civil war would require crushing that 1/3, which would more or less by definition mean using methods that would pretty much obviate the principles of freedom and democracy the revolutionaries are fighting for. How does one run a revolution for democratic principles against a majority?
IOW, any such war would not be a sectional war, as our "Civil War" was, but a more normal type of ideological civil war, with all the horrors of atrocity and counter-actrocity those entail.
Let's try to avoid doing this. :)
Lots of ways to make the wheels of society grind slower and slower. Just have to have enough pissed off people realize they each can do seemingly little things that add up to real sand in the gears of the oppressive machine.
In a way, what is happening, and will happen because of ObamaCare is almost "civil disobedience". We are being forced to become a nation of people and businesses finding ways to avoid or work around oppressive laws that will put us out of business or starve us if we don't. In one sense, that is civil disobedience. Oppressive laws and taxes have driven so much of the Italian economy underground that the government can't get a functional level of revenue, or control of the economy. We are moving in that direction.