I'm really unconvinced gerrymandering is the issue here.

It's not like Red cities have flock cameras and Blue cities don't.

It's really just that the Fairness Doctrine [1] needed to apply to more than radio. If you can constantly just repeat your point and then deny an opposition time then of course you'll get your point through.

Although maybe if super-pacs got outlawed then the Equal-time rule [2] would suffice.

[1]: https://en.wikipedia.org/wiki/Fairness_doctrine

[2]: https://en.wikipedia.org/wiki/Equal-time_rule

Races are virtually uncompetitive; it means politicians only need to pander to the 40% bloc of the 10–20% of voters that show up in the primary. Once elected, the chance of losing their office is nearly 0. Gerrymandering absolutely reduces effective voting power. That's the whole point.