The media took any and every chance they could to fuel the momentum in kerry's favor; kerry's campaign and the dnc operated under a perception of invincibility; and again the media did what they could to shape circumstances of the day to their liking- in favor of their candidate. President Bush won, despite these things. That he didn't huff and puff like gore or wax ad nauseam like kerry was frosting on the cake.
Actually in 2000, in his debates with Gore, his poll numbers rose, in pert because of lowball expectations, but the Bush campiagn got a boost in 2000 after the first debate with Gore.
Bush did good in the 2000 debates. Better than the 2004 ones I'd say since nothing could be blamed on him yet. Of course, it helped that Gore acted like a two year old.