As far as Bush goes he dropped the ball big time. Spent (His Moderate lackeys in Congress) domestically like crazy. Did not go after dems, instead he became a punching bag. Did not fight back at the bureaucracy and was absorbed in the incompetence of big government etc... 8 years of Bush/Repub control of Congress for some of those years became a very wasted opportunity for those seeking to control government.
If it was not for Obama I would be going third Party. You don't reward failure, but this year Obama poses a threat not only in terms of a hyper-collectivist ideology but a threat to the Constitution itself, especially every Amendment found in the Bill of Rights.