As much as we make fun of the crazy hardliners in the Republican party, they are enabled by a vicious hatred for Obama (and by extension, all Democrats). Think about what an outrageous shitlord Chris Christie is. If you look at his polling numbers you might think 'oh, okay, it's because he's such a shitlord'. But it's not. Fucking NJ's budget, cancelling the Hudson tunnel, screaming at and bullying teachers, none of it matters. His numbers are in the tank because he hugged Obama after Hurricane Sandy destroyed his state.
You can't think in terms of pragmatic governance or compromise, you have to imagine you are dealing with people who would be angry at their congress person for helping Obama rescue a drowning child. That's the kind hatred you're dealing with. It goes way, way beyond the hatred Democrats had for Bush.