On his radio show, Penny said that "I personally like Tim Walz, but I am disappointed by his recent campaign behavior."
In particular, Penny said he was dismayed to see a Walz ad that accused Demmer of wanting to privatize Social Security.
"That is a tactic used by Democrats every two years in order to frighten seniors into voting for them. The fact is neither major party would do anything to affect current retirees," Penny said.
He also alluded to an MPR analysis that concluded the Walz ad fails the truth test.
But Penny said that "I am even more alarmed by the latest Walz ad because it is not based on a public policy issue but is rather a personal attack."
That is an ad that criticizes Demmer for taking government subsidies. Penny said those subsidies include U.S.D.A. payments for Demmer's farm operation — something farmers across southern Minnesota get. He said that the ad also exaggerates by a factor of 10 how much Demmer received in tax-increment financing to establish businesses in Minnesota.
"My grandpa always told me if something is a half truth it is not the truth. To me, neither of these ads passes the truth test," he said.
Penny added that during his six terms representing southern Minnesota, he never ran a TV ad that attacked his opponent. To listen to Penny's radio commentary, go here.