The military will not back such a takeover. Their oath is to the Constitution, not the President. Many police departments & state law enforcement agencies will actively oppose the Obama takeover. Governors will rebel & ignore Obama edicts while loudly calling for his arrest.
The Justice Dept. lacks the troops necessary to control widespread riots. Obama could take & hold little more territory than Washington, DC. Many federal agents would quietly rebel against Obama. I doubt even the Secret Service would support an Obama takeover.
In the end, I think the military would remove Obama from office, along with those in Congress who block impeachment.
The bottom line is: Obama doesn't have enough gun totters on his side, & the vast majority would be against him.
The narcissist president surely views the pending election as a ‘coup attempt under color of law’. However, as a physical coward, he is probably not inclined to put himself in a situation fraught with so much risk. Much better to be a life-long member of the President’s Club and have the Left forever moan over what might have been.