In other words, John McCain thinks you are very, very stupid.
Josh Marshall aptly summarizes:
He's desperate and reckless. This is what it appears to be: political stunt dressed up as vainglorious self-sacrifice. In other words, typical John McCain.This campaign has left absurd in the dust on its way to surreal. I can no longer take McCain even semi-seriously as a politician. Watching the decline of someone previously admired by many is not something that makes me happy.