But no. Not on this angle, or so soon. This is nothing.
War, as always, is the health of the state.
Should Democrats return to power, they will not repeal the Patriot act or the war on terrorism -- they are too useful instruments for imprisonment, seizure of property, and other domestic interventions and intrusions. No, what will change are the definitions of terrorist and traitor.
Civil war requires that those with arms be divided into opposing factions. For all practical purposes this means the US military. As long as the military is united, or at least united in obedience to civilian control, there can be no civil war. Rather, there will merely(!) be internal repression.
A possible longer-term scenario: As regional interests increasingly diverge, as the idea of the nation declines, accelerated by demographic changes and immigration, soldier loyalty may substantially switch from civilian superiors to the service itself -- as it did for the Romans. That would bring a period of real Caesars. The seeds for that are already there, IMO. Semper Fidelis doesn't specify to whom or what one is faithful, after all, and it is reserved as a greeting for other members of the corps.
The danger of a standing army (or even police force) does not come from the army's guns so much as the psychological division between professional, career protectors and those they protect.