It is also interesting to point out Cameron Parish in the southwest corner of the state which I guess is more Catholic but has swung Republican much harder more recently while LaSalle Parish flipped in the 1950s.
Cameron is rapidly depopulating--it's extremely vulnerable to climate change and has been heavily damaged by most recent hurricanes. I wouldn't be surprised if there were electoral effects from this.
What do you think would be the electoral effects of this climate-driven depopulation, and why?
Not commenting so much on Plaquemines, but the only remaining industry in Cameron Parish is oil/gas extraction/refining, so the only reason people still live there is to work those jobs, which of course are a hyper-Republican demographic.
I am not so convinced Plaquemines will trend the same way; the last ones out will be the poorest/least able to move. Plaquemines does also contain some areas at the north end near New Orleans that won’t need to be abandoned any time soon (Belle Chasse, etc.). Although I could see stubbornness in the face of obvious doom being a Republican trait these days...