I am not sure the headline is justified by the survey. It seems the survey is just rural people. Its not just farmers. And it does not ask who you voted for last. So if that group has 70% voting for Trump that is about right. If the headline were accurate, it would mean that 30% of farmers changed their mind. But that is not what the pole was testing.
Remember there are a lot of organic little truck farms out there. And some of those always vote democrat. But the multi generational guys are for Trump. Farmers are actually being hit by the Low Carb phase and the strong dollar. Anyone raising Chicken Beef or Pork is doing well. While beans, corn and dairy are hurting.
https://www.nationalhogfarmer.com/marketing/higher-hog-prices-last
...Calculations by Lee Schulz at Iowa State University peg farrow to finish losses at $40.71 per head marketed during August.
That is down from a profit of $10.82 per head in July and the worst red ink since March 2013.
Schulz estimates the cost of production for August at $62.47 per hundredweight (carcass) or $46.86 per hundredweight (live)...