Anti-racism is anti-racism, period. The fact is, it doesn't matter if you're white and poor. If you minded being poor then you could vote differently to further your own interests. However, most white people, including the very poor ones, prefer to retain skin privilege rather than seek economic justice.
Anti-racists do not have the same fervor to labeling people 'black' or 'white' as racists do. Anti-racists realize that though "race" is a social construct, it is one that ranks people by the hue of their skin and that is an arbitrary way to organize human society. It asks people, indeed, to look beyond skin color, which, when considered "race," is more salient than being the human being you are.