The perception is far more important than the reality in a lot of cases. Dubya cultivated a poor perception over the last 10 weeks. That the perception is, in fact, inaccurate is valid, but to the extent the perception exists is the important thing.
Every conservative knows that the left has lied incessantly about this President since day 1. That's where the 'perception' comes from.
It is NOT what the President has or hasn't done, and it's not going to be changed by anything he does now.