Although there are plenty of polls that try to ascertain the racial views of different racial and political groups, I can't find any polls that look into the relation, if any, between income and racist attitudes within racial groups. Any help?
It can be hard to define and measure this without polling multiple questions and having the relevant crosstabs. I have found one poll from Gallup dealing with interracial marriage that has crosstabs based on education. Since education past high school is correlated very strongly with income, I think we can say that there is a somewhat negative correlation between income and racist beliefs.
It would of course be best to just have income based crosstabs, I don't think I've ever seen those in a public poll outside of presidential elections though.