CNN

Will race be the factor that keeps Obama from the White House?

Race is arguably the biggest issue in this election, and it's one that nobody's talking about.

The differences between Barack Obama and John McCain couldn't be more well-defined. Obama wants to change Washington. McCain is a part of Washington and a part of the Bush legacy. Yet the polls remain close. Doesn't make sense…unless it's race.

Time magazine's Michael Grunwald says race is the elephant in the room. He says Barack Obama needs to tread lightly as he fights back against the McCain-Palin campaign attacks.

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