I feel stupid. What are you talking about? Or is this a joke scenario or something? Sorry if I'm being daft.
If the people in office get voted out, they leave. If they didn't, we might have a problem.
This is dangerous that after they and someone replaces them the story repeats like a record player in a lop, only with louder volume. (I wish I could think of a better analogy)
I think that's a bit of a (very large) stretch. I think the "President" and the military are separate enough in this country that we don't run a huge risk of "THE GOVERNMENT" (ie, a "leader" and militia to empower them) could or would act as a cohesive force against the US.
Usually when you see this, you see fractioned militia that support the next successor or what not.