Biden. Nashville area will go to Warren, but that's probably it.
I agree with this, but Warren could also do well in East Tennessee.
While it's a very white area, I don't think it's going to be terribly friendly to Warren. Maybe she'll do alright in Knoxville, but I very much expect this to be different than 2016, and Biden will actually do better with rural white Dems (because they skew non-college and less actively liberal).
That is true, but lots of times in really conservative areas, especially in Appalachia, those Democrats that do still remain tend to be the true believers and more left leaning than your average Democrat.