Conservatives have the guns. They're hunters/outdoorsmen and they're better marksmen. They live in areas where guns aren't virtually outlawed {like Chicago, NY, NJ etc.}. They've served their country, believe in the constitution and have a cause worth dying for. They're better trained, better equipped and would be more motivated. CONCLUSION: Liberals would be wiped off the map faster than you can say "living wage".
You'll have to think this through. Are there really enough psychopaths on the right willing to gleefully kill their fellow Americans? Where do you think the Armed Forces would come down on this? My prediction, a small group of the truly disturbed gets quickly squashed.
The Armed Forces would split like a ripe melon dropped from a tall building.