Here's a great explnation of this particular point in history.
1. Repbulicans in President Bush's second term sucked:
They were idiots, they were no good at the whole fiscal conservatism thing (which is sort of the whole point of them), we had these wars that seemed to be going nowhere, and the economy was beginning to fail.
2. But Democrats under President Obama have sucked even worse:
But not just plain old, usual politician sucked, but epic levels of suck where it's hard to find an analog in human history that conveys the same level of suckitude. It was sheer incompetence plus arrogance — and those things do not complement each other well. We're talking sucking that distorts time and space like a black hole.
People remember how much Republicans sucked and the fact that there seemed to be a top limit to their suckiness. But we've never had to deal with a level of suckiness this horrible, and Americans really aren't that curious "to see how much worse it can be."
3. Which leads to a version of the "one-eyed man in the kingdom of the blind":
So the Republicans kinda suck, and that's why they're going to win huge this November. Because in the land of epic, mega, ultra, apocalyptic levels of sucking, those who kinda suck are king. Or at least are going to win in a landslide.