Worst Case like you say, refuse the election result and start arresting any one who fights them on it. Be congress or senators. Blacks will riot and burn their neighborhoods and the Whites will start fighting back then guess what? Obama can declare the national emergency. He then accomplishes he goal.
“HIS GOAL”
That scenario might just backfire. The Silent Majority still exists but is loath to resort to violence without one hell of a reason. Your scenario might provide a spark that would ignite a fire that won't be quenched until Freedom is restored.