What if the Apportionment was based on voters, not population?
imo that would be a bad idea. If your state is probably going to go for the other party (ie if you are a democrat in TX or a republican in NY), it's in your best interest not to vote - therefore denying the candidate you don't want to win added electoral votes and, if you're in a state that is likely to have lots of the other party's members as representatives, denying them seats in the House.
A much better idea would be to apportion the House based on the number of citizens in a state. Currently states are rewarded for harboring illegal immigrants. CA, FL, AZ, NY all have extra districts due to the presence of non-citizens (both legal and illegal).