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.
^this. Plus I imagine poorer folks, as well as the very small Black community in the parish, were more likely to live in areas which were lower lying and thus more heavily devastated by the hurricanes and that's probably a marginally more Democratic demographic.