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You made an excellent point: "White America is not binary racist/non-racist. There is a broad spectrum ranging from white supremacists on the far right to the truly colorblind. But in the middle of this spectrum are large numbers of people who WANT to be non-racist but can't help viewing things through long-ingrained stereotypes."
I have always thought the "race" problem Obama would face would be the people in the "middle of the spectrum." Many of those people don't want to be racist and may not be ready to see a black man as capable of being President. But over the next two months this will change as more and more people see Obama and see that he is capable, competent, wise, intelligent, etc. And I agree that Biden is a superb pick. He will help the ticket in many ways but also by moving many people to the point where they can accept Obama as President.
Now, everyone needs to get out there - get on the phone banks, get on your walking shoes and go door-to-door. I have arthritis (oh, I hope Phil Gramm doesn't accuse me of whining) in both knees and one ankle but, hey, lots of Advil keep me going! There is an 80something women who comes to the office near my home with her caregiver - she is in a wheelchair but she and her caregiver come in a couple of times a week to phone bank. That is pretty inspirational.
If you live in a solid blue state and can afford to, consider spending some time in a swing state. I'm in Virginia and you would not believe the energy here.