I suspect that kerry blackmailed McCain into defending him as a war hero. These guys know where the bodies are buried. Literally. They worked together on selling out the POW-MIAs. And if kerry has some of hillary's FBI files, he may know something about McCain's conduct while he was a POW.
McCain literally is directly responsible for the new infusion of cash into rat coffers via the 527's
Maniacs both of them.
There was money to be made in Viet Nam. They worked hard to normalize relations with that country which meant sweeping the POW issue under the table.