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“Vibe shift”: Young Texas voters, motivated by Kamala Harris, lock into the presidential election
(www.texastribune.org)
this post was submitted on 12 Aug 2024
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politics
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Gerrymandering can be pretty brittle. It relies on accurate models of who will vote and for whom. If the underlying assumptions are either wrong or change, then it can backfire. Here's an extreme napkin-math example to illustrate the point:
You have 3 districts. Candidate A is extremely unpopular. You split the voters to get 2 out of 3 districts for candidate A.
District 1:
Candidate A: 5%
Candidate B: 50%
Not Voting: 45%
District 2:
Candidate A: 20%
Candidate B: 15%
Not Voting: 65%
District 3:
Candidate A: 25%
Candidate B: 20%
Not Voting: 55%
As you can see, even though if you add up all the voters for candidate B they heavily outnumber candidate A's voters, by siloing them into one district you can win. But look at the margins for the other 2 districts. It doesn't take many new voters who you assumed wouldn't vote to upset your scheme. Depending on exactly how unpopular your candidate is, the margins for this might be pretty tight. It only takes an extra 10% of the voters moving from not voting to candidate B to cause a landslide 3 district sweep in this example.
It has been working well for them for a long time though.
Gerrymandering is indeed a powerful tool. I'm just saying that it can backfire under the right conditions.