I'm not going to write an essay, but I would think the conservatives might well win because military hierarchy tends to be conservative and conservative civilians, I think, tend to be better armed than liberals, though neither side is more committed to their cause. If the president were more liberal than conservative, I wonder how the generals and admirals would follow the orders of their commander in chief. Foreign powers would revel in the second American Civil War and might well contribute to both sides so we would destroy ourselves, and no IEDs would be needed nor would suicide attacks in any way. I don't think either side would have an edge in terrain simply because the war would be fought over the whole country in all sorts of terrain. I'm no young man, but I hope my new granddaughter lives to be a funny old lady and never finds out in the real world the answer to your question. Of course, neither side would win. One side would just lose less than the other.