Law Professor Richard Pildes here presents a plan to add 150 more members of the U.S. House. The new members would be elected statewide, or possibly in large regions of each state that would elect 3 or 4 members. The new members would be chosen in a manner to create proportional representation between each of the two major parties. If the previous statewide vote for U.S. House in a particular state showed that 60% of the electorate favored Republicans, then the new members would be seated so as to create a total delegation from that state in which 60% of the members were Republicans. This aspect would eliminate incentives for state legislatures to draw gerrymandered districts.
It’s unfortunate that his plan doesn’t include minor parties into the proportional system. Also the system doesn’t really work unless a state has party nominees for U.S. House, which is not the case in Alaska, California, Louisiana and Washington.