Is the USA headed for civil war?

I wanted to get this out first.
Last year there was some commotion around the prediction of a Russian politician that the USA was headed for civil war. At that time the Sarah Palin nomination (as VP candidate for the Republican Party) had just split the country into unbelieving independents and democrats on the one side; and a fired up "conservative" base of Evangelicals and neo-conservatives. Still almost every commentator dismissed the civil war prediction as too far-fetched.
Fast-forward to this year - post the Obama inauguration, the Republican party and its base have been getting crazier and crazier. Unhinged is too mild a word for these lunatics. For any neutral observer, this is the current situation:
1. An array of right-wing pundits such as Rush Limbaugh(radio), Glenn Beck (Fox) and Bill O'Reilly (Fox) have been equating Obama's administration with the Nazis and have been talking about "driving a stake through the heart" of the admin. They have been calling any policy move by Obama and the progressive Democrats as "tyranny" and "socialism".
Any intelligent debate has been cancelled out by applying terms such as socialism and Marxism to policies such as healthcare. Right now, there is neither an attempt to debate nor any interest by the entire right-wing intelligentsia.
2. A set of "astro-turf" groups calling themselves Tea-baggers have become a channel for expressing incredible racism and anger against the democrats and Obama in particular. These groups have shown zero understanding of policy issues, but scream "tyranny" and "socialism" against a legitimately elected government.
3. Another group of people called the "Birthers" have been expressing the conspiracy theory that Obama is a Manchurian candidate and that he is not an American citizen. Apparently more than 60% of Republicans believe that the current President of the USA is not a citizen of the uSA and therefore consider his election illegitimate.
4. What is more shocking is that the Republican Party leadership falls in line with their party's most lunatic fringe. They show no interest in contradicting or controlling these conspiracy theories.
5. At present the Republican Party has the lowest approval rating in history. It has beocme a party of the American South, and has become a refuge for racists, white supremacists and Christian fundamentalists.
6. One of the starkest battles going on right now is the healthcare debate. The "public option" proposed by the progressives is neither out-of-the-world, nor is it socialism. The Democratic congressmen have been organizing town hall meetings to discuss the healthcare reform bill. Right-wing thugs such as Glenn Beck and Rush Limbaugh and a few Republican operatives have sought to disrupt these townhalls with screaming mobs who are not even there to discuss policy.

Right now, it seems the Republican party has been taken over by its ultra-right fringe. There have been several instances of lone gunmen shooting and killing innocent people since the election.
Both the deeply racist and fundamentalist crowds seem to have come together mainly because the Republican leadership is lost. At this point, particularly after the town hall meetings fiasco, it is obvious that the right-wing is taking more and more steps to push their agenda by fascist, violent means.
Thus, they consider the current president illegitimate for reasons of race; and because of a conspiracy theory that he was not born in the USA. They think Obama is a secret Marxist. They think the government is engaging in tyranny and have been advocating revolution.
At this point a civil war breaking out does not seem remote. I think we will see more acts of violence and more incitement to violence by right-wing leaders and their followers.