John "Get Off My Lawn" McCain has lost it..

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Bizarre..

John McCain was caught sticking his tongue out at hecklers and yelling at them to 'shut up' during a political rally on the eve of the election.

The Arizona senator, who ran for the White House against Obama four years ago, was campaigning for Republican senate candidate Jeff Flake when he made the undignified outburst at members of the audience.

Speaking from a podium in front of the courthouse in Prescott, McCain said: 'Even here in this wonderful square, jerks are allowed. You're allowed jerks.'

He then gestured wildly before sticking out his tongue and adding: 'I'm getting too old to put up with jerks like you.'