Yes, 90+% of "racists" would probably describe themselves as conservatives, just like the people that torched those houses in Washington and California would probably call themselves liberals. However, your average Democrat voter isn't going to like arson and vandalism any more than the average Republican likes this plot against Senator Obama.
As Sonnabend pointed out, the murder of Senator Obama would be a stain on this country's history - this is America, not Venezuela. Personally, if I don't like someone - say a presidential candidate for example - the prospect of them losing the election beats their untimely death by a million to one. I, for one, am glad that the Senator is unharmed.