Obama would lose the general election

I have done a fifty state analysis and I can see no way for Obama to win the general election.  I can see no state that Obama can win that Kerry lost in the last election.  I believe that he would lose several of the states in the upper Midwest and would end up with about 170 electoral votes of the 270 needed.  He is the weakest of the big three candidates and the one most likely to lose.  I can come up with a way for Hillary Clinton to win.  I have not done the analysis for Edwards but many people think he would be the strongest candidate even though I don't see it that way.