I think it really has to be. I think there is a good chance he'll lose the traditional battleground states (like FL, PA and OH) so his best strategy is to sweep the western states and states like NC (although, frankly, I can't imagine he'll win in NC, given his 20+ point loss among white voters).
Actually, if you look at the exit polls Obama lost all the non-African American working class voters. Actually, he lost all non-African American voters period. I am to sure you can extrapolate his win to suggest he is winning the the bulk of Blue Color Americans. Sadly.
If you are correct why do you think the super delegates are not coming forward to end the nomination? Why has Dean stacked the Rules and Bylaws committee with Clinton loyalists? Why is Obama even competing?