Nate Silver charts the dissatisfaction:
A credible independent bid for the presidency is always a long-shot, but might be more viable under these conditions. Or we may simply see a genuine anti-incumbent wave — a much-discussed phenomenon that has rarely occurred in practice — with significant numbers of elected officials in both parties losing office. It is not out of the question that Democrats could lose the White House but take back control of the House of Representatives.
The Dish 