So you already moved the goal posts by quietly removing Bernie Sanders from your list of people who supposedly aren't talking about these things.
I don't know if she says "rural whites" verbatim, but Warren talks about rural issues all the time. It's one of the central tenets of her campaign -- that previous Democratic candidates (other than Sanders) ignored rural America, and she isn't. She campaigns in small rural towns that few other candidates will campaign in.
https://medium.com/@teamwarren/my-plan-to-invest-in-rural-am...