Bush, as every re-elected president, overvalues the power of a second term. Witness Arlen Spector telling Bush that he doesn't want to see any overly conservative judges sent to the Senate for confirmation, especially to the Supreme Court. Spector will be a senator six years from now, when Bush is a former president. One third of the senate is in that position and another 1/3 won't run again before Bush enter his last days.
I think that Bush will find that he used all his capital to get elected and that everyone else in DC is worried about the next election, rather than glorying in the last one.
Will he be able to push through bills? Not if it doesn't help the reps and sens get re-elected. Most of them don't owe anything to southern conservatives and the religious right. He will disappoint the Ralph Reeds of the world, just as Rethuglicans have always done. Abortion and other moral concerns are campaign issues, not legislative matters for the Rethugs, but they keep fooling the believers.