Why do so many dislike Obama ?

Ok.. Just to make it clear - I am PRO-Obama !! I am glad he won and that Mccain didn't. I was happy to know that Obama won .. it was indication that racisim has reduced in america and that people are willing to stick up for an underdog - and not go with the elites... i don;t understand why so many ppl dislike obama.. from what i understood of him during the campaign.. he is a well educated guy who thinks for all and not just a few.. why are people hating him so much ?? i have been watching the news and i think he said it at the very beginning that decisions wont be easy, we will have to make tough decisions.. i am surprised that he hasn't even taken the seat and people are criticing him so much.. whereas Bush stayed in power weakening america's economy and the people kept over looking his reckless decisions lovingly yet to elect him for another 4 years and still continue to defend him.. should i call this ignorance, racisim or something else (pls name it).