Because on one issue 20 years ago he disagreed with some at ISU, he clearly hates ISU.
Also, a book written by the guy who lead the opposition to the sale doesnt seem like much of an unbiased source.
You wanted evidence, I gave you evidence. He didn't "disagree" on an issue with ISU. He and Pomerantz engineered the entire thing themselves against the wishes of pretty much everyone not named Branstad and Pomerantz. Of course the author isn't unbiased, but he's got research and facts to back up his claims, and that's more than you're offering at the moment.