alt Hacker News> Of course it works in reverse
This math doesn't work in reverse because there aren't as many applicable people or relevant districts in the rest of the states.
Mississippi has far fewer total disenfranchised Democrats (in both absolute number, district count, etc.) than California has disenfranchised Republicans.
Without extreme gerrymandering, there simply aren't enough eligible-to-be-swung electoral votes to meaningfully benefit Democrats in rural states.
You do not need disenfranchisement, just apathetic voters who do not currently contribute. Right now there are ~23 million voters registered in California. 45% registered D, 25 %R, giving absolute numbers of 10 million D, and ~6 million R. Which you can handwave is 4 million Ds who know they do not need to contribute - their neighbor has their back to secure the state electoral votes.
Looking at the US as a whole, there are 44 million registered D with 37 million R. If you could round up all affiliated voters, Dems win the presidency every election if going by popular vote[0].
[0] https://usafacts.org/articles/how-many-voters-have-a-party-a...