The Cincinnati Enquirer got to the bottom of it:

Radio talk show host Bill Cunningham told listeners today that Mike DeWine, John McCain’s Ohio campaign chairman, and county prosecutor Joe Deters asked him over lunch last week to speak at the McCain rally.

They wanted him “to throw some red meat to the crowd… To get the crowd on their feet and get them happy,” he said.

DeWine is a former U.S. senator and Deters used to run the Republican party in Hamilton County. Deters spoke at the rally.

Cunningham is a huge name here in Cincinnati. Everyone knows who he is. He has been controversial and been on the area’s biggest radio station for a very long time. Can you seriously tell me that DeWine invited him not thinking he wouldn’t cause some controversy? I call bull shit on that.