Yes but they are not politicians. You are saying he was a traitor, not just less than a hero?
Here's what's going on.
What is KNOWN , without question, is the following:
John McCain volunteered to serve and fight. He could have probably negotiated an easier job, but he wanted to fight.
He was shot down over enemy territory while flying his 23rd combat mission.
He was captured, his shoulder was shattered by a rifle butt and he was bayoneted.
He was denied medical assistance while being interrogated, and was beaten.
He was eventually sent to a hospital where other American POWs have stated that they doubted that he would survive.
He did recover and was then kept in solitary confinement for two years.
He spent a total of five and a half years as a POW.
In the years since all that happen, and as McCain's politics began to earn him the scorn of right wing political activists (mind you, the people of Arizona seem to like him well enough, he keeps getting re-elected) attacks on McCain's service record began to surface.
None are documented, most are just accusations, but the one clear thing you can see is that these attacks are politically motivated.
I am no fan of John McCain, but I detest rumor mongering and whisper campaigns.
To make a long and sordid story short, there are a number of people who have claimed that McCain is a traitor and that there is a huge government cover-up designed to hide his treason. There's no real proof of that mind you, but to conspiracy theorists, lack of proof of a conspiracy is proof of that conspirator.
To wit, you'll look around the 'net and find a number of people making all kinds of claims that McCain did this or that, and they will seem quite passionate about it.
Just as passionate as those folk who claim that there was never a moon landing, that Princess Diana's death was actually a hit job by the British Secret Service, that the deadly HIV/AIDS virus was created by the CIA to wipe out homosexuals and African Americans, that 9/11 was an inside job, that the Sandy Hook massacre didn't really happen, that the Holocaust is a hoax, that George W. Bush had the Army Corps of Engineers breached the levees to flood poor black neighborhoods in New Orleans in order to save the richer, white neighborhoods, that the government and big pharmaceutical vaccines are hiding proof that vaccines cause autism, that Paul McCartney died in 1966 and was replaced by a look-alike named William "Billy" Shears, that Roosevelt had advance warning of the attack on Pearl Harbor, global warming, that the USSR threw the championship game in the 1980 Olympics, or that The Protocols of The Elders of Zion are anything more than a fabrication by the Russian Empire's secret police sometime in the late 1890's.
Here's a link for you:
http://www.miafacts.org/mccain.htm