Trump, quoted here:
'“I love Iowa, and I honestly believe those polls are wrong,” he said. “I’m a Presbyterian, I’m a great Christian.”'
Forty percent of Iowa corn gets diverted to ethanol production, without which food prices would drop as feed prices normalize. All of which would mean harder times for Iowans.
Carson wants to add ethanol infrastructure and increase its share in gasoline to 30% instead of the current 10%:
'“Therefore, I would probably be in favor of taking that $4 billion a year we spend on oil subsidies and using that in new fueling stations" for 30 percent ethanol blends, he added.'
If Trump were smart he would exploit the unpopularity of ethanol with the American people revealed in polling to marginalize Carson nationally on the issue, but that will never sway Iowa voters tied to ethanol for their livelihood, sort of like preaching against gambling in Vegas.
Trump can afford to lose Iowa, and probably will.
He should move on.