Silver Bow & Deer Lodge counties MT

[Wormless Gourd]

Deer Lodge last went Republican in the 1920s before Dem-aligned, organized labor voting really took off. Silver Bow voted for Eisenhower in 1956(like many other usually Democratic counties that year) but the last time before that was also in the 1920s. Eisenhower almost won Deer Lodge as well.
Historically both counties are something of a bubble of union-influenced Irish Catholic voters and that demographic is more resilient/slower to follow trends. 
Trump still hit above 40% in both counties in 2016/2020, which is a first for a Republican in decades.
Another round of losses by Democrats among non-college white voters would probably flip the counties, but Deer Lodge(+7.7 Biden, more rural) before Silver Bow(+14.2 Biden, contains the growing town of Butte)