Obama cannot suspend the Constitution. His office is derived from that Constitution, as are any Executive Orders he may issue. Suspending it suspends his own authority. He may attempt to do so, but no one is obligated to follow.
He also cannot extend his term in office, as it vacates him Jan 20, 2017. He also cannot suspend elections, as that is state controlled and ordained. Any attempt to do either would carry no legal weight and I expect ignored by most states.
Any official following him in the above actions will be committing treason and engaging in domestic terrorism. There will be no need for investigation or trial, they will be subject to summary field execution, simple as that.
As I said, unless Zero sends out the entire contingent of U.S. Marines, I’m not worried about a bunch of SWAT trained dynamic entry jockeys. They will be fodder in the open field, and we will have all their toys.
When they get serious about taking us out, they won’t send people... they’ll send drones. Good luck with that.