I think they have a good point though. Sure, at a basic level, you can’t gerrymander a senate election. But you start with the state, draw the district lines. Now the state is gerrymandered, often packing dense districts with democrats. Now your state legislature (gerrymandered as hell) passes a law that says 2 voting machines per district. You bet your ass that affects national elections. Ol’ Jim-Bob has to share his two voting machines with 150 other people, whereas a city dwelling Democrat has to share theirs with a few thousand.