. . . that McCain has turned into a liar.

http://ap.google.com/article/ALeqM5jMtvzhUJmkDwVPsjJ0vhp-MDl1-gD9359Q2O0

McCain's persistence in pushing dubious claims is all the more notable
because many political insiders consider him one of the greatest living
victims of underhanded campaigning. Locked in a tight race with George W.
Bush for the Republican presidential nomination in 2000, McCain was rocked
in South Carolina by a whisper campaign claiming he had fathered an
illegitimate black child and was mentally unstable.