Actually, whoever runs the state legislatures, determines the results of the elections.
the census is going to count illegal aliens because they are considered “persons” as the Constitution sets forth. So that is why areas with heavy illegals are over-represented. Notice some state House seats in places like L.A. have very few voters. Therefore, these voters are over-represented ... the illegals have representation.
The only think it doesn’t affect is GOV and SEN races.