The far left would be up in arms and ACORN would be rioting in the streets with uzis. That would lead to us normal people taking to the streets to defend our country.
If he violated the Constitution, being warned of the repercussions of his actions all the while, in order to make himself a dictator, I would join the military myself.
Peace
One of three scenarios most likely:
1. The military would peacefully or forcefully removed Obama
2. The military would not obey the Supreme Court
3. The military would divide their loyalty between SCOTUS and the President and their would be civil war.