There actually is a strong trend of white supremacist groups supporting modern Democrats precisely because both see the world in racialized terms, despite the fact that race is a purely social construct with no basis in biology. When white supremacist groups support modern Democrats, it's an "accelerationist" type of thing to do: They like the racial tensions that Democrats stoke believing that those racial tensions will lead sooner to massive conflict that will enable them to enact their white supremacist goals openly.