I think it will be somewhat (relatively) easy to win rural voters in 2020:
"Trump's trade war is crushing all of you farmers. That ends the day I'm elected. We make a deal with China and stop fighting with everyone else, you get your markets back."
"I have a plan".
Specifically, Warren has multiple plans for rural investments and development. Won't bring back neo-Nazi angry white men or evangelicals, but I think normal, blue collar farmers will listen and vote for someone who offers them some hope.
Unlike President Deuchebag.