This evening there are post-mortems galore.
Fortunately, Michael Gerson of the Washington Post has a far more articulate reaction than anything I could write:
After a series of political humiliations, Obama called on Republicans to change their course. Facing a general revolt against Washington, he proudly took credit for posting the names of White House visitors online. Promising to change the tone in Washington, he managed to be petty, backward looking, defiant and self-justifying.
Barack Obama has lost his promise. He has lost his momentum. He has lost his touch. He has lost his filibuster-proof Senate majority. He has lost his first year in office.
Tonight, he lost his grip on reality.