Iowa Caucus - Racism

This idea of a caucus is racist in so many ways. Firstly, why is it ok to call a group of Caucasians a 'caucus'? Frankly, it sounds insulting. Secondly, why doesn't Iowa allow people who are of non-caucus heritage the right to vote? That's illegal, plain and simple.

In fairness, I haven't read up on the exact ins and outs of the Iowa primaries.