Lets not forget the historic nature of Obama's second term. Only one Democratic President Since FRD has won two majority elections, Obama. To fully understand the impact of that we see the cycle of elections, in which 20 dems and 10 repubs ( aprox) were up against elections, and somehow the Democrats still made gains on the seats. That means that in two years, they will probably be fighting more on their own turf. IF the GOP does not change it's anti woman, anti imigrant stance, they will lose more. The filibuster is going to be changed in the new senate, and obstruction there will end.
The GOP losses in the house were clear indications that at a local level, Loonytoon Tea baggers are being Isolated and pushed out. The GOp MUST moderate it's stance or it's going to lose the midterms. IF that happens, and Obama is given full control of the house and senate for his last two years, you will see an unstoppable Obama.
For the GOP to hold the house, they need to start cooperating and stop with the obstruction. If they don't the american people will take them out of power in the midterm, and they will lose far more than a pledge to Grover Norquist.
All that's left is the posturing, but the Bush tax cuts are gone, and a new tax break percentage is going to be worked out, and for every point that the wealthy keep, The GOP will have to remove a loophole for the wealthy... A little concept called pay as you go.