What would another United States Civil War look like?

One of the newscasters during President Obama’s inauguration said we switched from one political party to another without shedding a drop of blood. I started thinking about that and I ended up wondering what a civil war in the U.S. would look like in 2009.

Modern warfare with missles and roadside bombs? Republican suicide bombers? Or would people just pick sides and use their own household guns to shoot at the enemies? Would it be organized (can civil wars be organized??) Who would win, Republicans or Democrats? Would Nader lead a separate militia? Would the two sides even be political parties, or would we split over different reasons?