Red tends to mean south and that tends to mean more "undocumented aliens." These shadow people are not going to be as well off as citizens.
California has the largest amount of illegal aliens, and as other freeper(s) have pointed out, there is considerable crime compared to some states. However, it is not comparatively poor. And, of course, it is a blue state.
Texas is a red state, and also has a lot of aliens--and they aren't that poor, either.