Under this map, the Pacific and Midwest regions would be merged into one, to be named the "West", while the Southeast and Mideast regions would be combined into the "East" region. The Northeast region, which has long been the most populous, would remain unchanged.
This proposal would also, necessarily, reduce the number of regional Senators by two, bringing the total membership of the chamber to eight.
I think such an admittedly drastic change to the game's geographical structure. The two "super regions" would, hopefully be a lot more active than the fairly slow Pacific and Southeast regions, and cutting down on the number of regions makes it harder for a political party to establish dominance in a region. The Southeast and Midwest would also be able to keep their unique culture under this plan, by simply electing representatives of the former regions. There's nothing stopping the West's legislature from being called the Alping, etc, etc.
Probably needs some tweaks, but hey.