1) you don't need to amend the constitution. The constition just requires proportional seats in the house per size of state, how those seats get allocated isn'

1) you don't need to amend the constitution. The constition just requires proportional seats in the house per size of state, how those seats get allocated isn't defined by the consititution. It's currently defined by federal law (i.e. congress has the ability to define it) and is defined as single district voting. That can easily change if congress (i.e. the people) wanted it to 2) as others have noted, there's no reason we even need districts under the constitution. Just let people vote for a party and divide the seats that way. I did the math after the previous election and if we divided each states seats by the way they voted for president, california would have a lot more republican seats, but the republicans would still control the house with a smaller margin overall.