I see several things at play here...indulge me
1. Republican Hegemony
Karl Rove (aka Bush's brain) said during the Bush years that this ushered in an unending republican hegemony. The loss of control of both houses in 2006 combined with the election of a Democrat in 2008 ended that fantasy much to the chagrin of conservatives
2. Barack Obama (the anti-Bush)
Where Bush was a bumbling, incoherent anti-intellectual....Obama was an articulate, poised and intellectual. The differences between the two men in terms of style and approach could not be more different. Conservatives prefer someone who appears to be incompetent because it charms their base.
3. Barack Obama (the "outsider"
They hate him because he is a Democrat and Black with emphasis on "black". There are so many ignorant, under-educated, poor and "on the dole" conservatives that hate him for being black, pure and simple.
4. Barack Obama (President)
Based on #1-3 above they want to stop anything he is doing just to show him that an arrogant n****r cannot get his way in this country.
5. Policy
The current Republican "policy" is about one thing - serving their corporate masters. That means tax cuts for the rich, tax loopholes for the rich and powerful including corporations, satisfying the religious nuts in the house with limitations on abortion, "personhood" for fetuses, give aways of money and rights to religious organizations, etc.
They rely on the stupidity of the Republican base to not understand these policies actually keep them poor and hungry. They use Abortion, God, Gays and Guns to divert attention from what they are really doing which is enriching themselves and their corporate masters.