If you look at the estimate at pollster, they have Obama with 311 electoral votes which is 41 electoral votes above the magic 270.   What is interesting about this poll, is that this estimate does not count many of the states for Obama where there is active republican suppression of the vote going on: Florida and  North Carolina.   Nor does the estimate count tossup states: Missouri, Indiana, Georgia.   About the only state that is given to Obama that might be questionable is Ohio which has 20 electoral votes.  Give up Ohio, and Obama still wins with a Pennsylvania (21 electoral votes) to spare.  So, Obama could win even if he loses Ohio and Pennsylvania.   McCain — stuff that in your depends and shove it up your lying ass.

Why is it possible for Obama to win without Ohio or Pennsylvania?

Yes, Virginia — Obama is President.