Flim Flam Forever:

the really crucial thing for the WH is a matter of principle: no deal unless the extortion ends. And Rs just can’t or won’t give up the idea that they deserve to be rewarded for not blowing up the world.

Krugman nails it. Obama was too easy on the GOP early on thinking they would reward his cooperation. He let think this as a valuable tactic. And now it has to end.