I do agree with sasquatch that there are people who will bash Bush no matter what. Bush did start out trying to work with the Democrats. Many of the Democrats really did start attacking Bush like crazy. They then tried to take the moral ground as if it was Bush that was attacking them.
There is just something that happened with many liberals that they cannot stand Bush. And this hate has been growing and festering for 5 years now. There was a similar reaction to Clinton by the Right. (It subsided with him being out of office, but it is still there.)
I believe it stems from the 2000 election. Their candidate got the majority, but not the electoral college. That was upsetting to them, and they thought it was wrong, regardless of the rules. Instead of an obvious win or loss, they got an extra couple of months where there were recounts. The instant win or loss turned into two groups of people thinking their candidate should win, and that just festered. Once one was the winner, because it didn't seem as decisive, anger about having a win taken from them turned into anger.
I am not trying to rehash this crap as much as explain where the anger stems from. Hopefully it will subside with the next president. Unfortunately I doubt that, and am beginning to think it has become entrenched into political thinking for years to come.