Liberals vs. Conservatives: A second Civil War?

Do you think it is possible that, 100 years from now, the perpetual tension between liberals and conservatives in the U.S. will erupt into a violent civil war...or is that the stuff of great fiction?
Update: If it makes any difference: Democrats vs. Republicans, instead of Liberals vs. Conservatives.
Update 2: Keep in mind, I'm not talking about 5, 10, or 20 years from now. I'm talking about 100 years from today.

A lot of things can happen in that time span. Things could either get better, or it could get worse.
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