As the campaign goes on, we see that a segment of (but by no means all) older white Democrats has a persistent problem with Obama. This is Clinton's real base. Pew:
White Democrats who hold unfavorable views of Obama are much more likely than those who have favorable opinions of him to say that equal rights for minorities have been pushed too far; they also are more likely to disapprove of interracial dating, and are more concerned about the threat that immigrants may pose to American values. In addition, nearly a quarter of white Democrats (23%) who hold a negative view of Obama believe he is a Muslim.
There's been plenty of supposition, and some anecdotal evidence, to suggest that conservative views on race have hurt Obama among older whites. The Pew poll, though, is the first I've seen to establish this relationship empirically.
A certain residual core will never accept gays either. I've learned that the hard way. But the future is being forged in this election. It really is a generational battle in so many ways. It's beyond right and left; it's really about the future and the past. And the future is never born without struggle.