I think that a Democratic President will basically counter everything that Bush and the Republicans did during his eight years in office.  For most of his Presidency, George Bush has a Republican congress that, for the most part, agreed with his policies.  Several bills were passed because there was little debate between Bush and his Congress.  For example, funding for the wars in Iraq and Afghanistan.

Also, since Bush's approval rating is  down to record lows, I would imagine that Obama has some "cleaning up" to do.  He will have to reverse everything that Bush did in order to get his approval rating up.  Now that he has a Democratic congress it should be easy for him to get that taken care of.

On a different note, I feel that people have high expectations for Obama.  Expectations that are so high that people are going to feel betrayed if he does something that goes against what they believe.  Not every President can hold true to their policies, but it's usually outside of their control.  Congress has half the say about what bills become laws.  High expectations is not what this country needs at the moment.

I just hope this whole thing doesn't become a ticking time bomb.  The following video, although satirical, does have to some truth built into it.  Now that Obama is elected, his most avid supporters have nothing to do anymore.

Obama Win Causes Obsessive Supporters To Realize How Empty Their Lives Are