Rather than Civil War why not Article V, the Convention of States? There are already 15 states signed up, we simply need 19 more.
If this were to happen, one of the first items I'd want emblazoned onto the Constitution is making the practice of, support of, or the action of actively working toward Communism, Marxism, or any socialistic practice that can possibly deny the rights of individuals, entirely illegal - punishable by death.
Because the enemy always has a vote. They have already voted by their actions to ignore the Constitution. What changes with an Article V?