I blogged about the interesting link between #mentalhealth - depression - and voting for Trump in the 2024 election. A relationship between these variables at the county level stands up, in a model correcting for spatial autocorrelation and a state level random effect (using #rstats mgcv::gam).
Of course the causality is unlikely to be depression -> vote GOP, but to reflect an underlying common economic or social cause.
https://freerangestats.info/blog/2024/12/23/depression-and-vote
Depression incidence by county and vote for Trump
Multi-level modelling with spatial auto-correlation! I look at county level data on incidence of depression in 2020, and voting for Trump in the 2024 US Presidential election, and conclude that there's something there, but of course there are lots of potential explanations of what is behind the relationship.