Maybe it is a temporary blip over the birther issue, and if and when that issue fades, will blip back.
It could also be that Cruz has been hammered on the ethanol issue lately too.
Trump loves ethanol? Yet another reason to excoriate the man!
Take it up with the great people of Iowa.
I have, and in particular with the good folks of Winterset, Iowa. They tend to just hang their heads, and continue to cash their checks. It's one of the reasons that I sold the river bottomland corn fields on the family farm. I did not want an asset whose value was so closely tied to the ethanol heist, for both prudential financial reasons, and ethical reasons.