A white Democrat who didn't vote for Obama, may have done so, very well, for racist reasons...we can never know. But a otherwise, staunch, liberal Democrat, who has contributed substantially, in past elections to potential candidates' coffers, and now chooses to withhold contributions, cannot be seen as "racist", on the face, but, perhaps, as "disgruntled", "disillusioned", or disappointed with President Obama and the expectations placed on him, realistically and unrealistically. I don't think that makes her a racist.
On the other hand, from the outset of Barack Obama's candidacy, those on the right have actively sought to find the "chink in the armor", and have gone as far as to promote lies about his qualifications, his birth, his religion, his heritage, attack him for his past associations, his name, his stark intelligence, the kitchen sink. Most of the attacks appear to be "racially-based" or motivated by his race. No white Presidential candidate has ever been treated thusly. Not a one. Only one conclusion can be drawn.