IS McCAIN A HOT HEAD ?

Is McCain a hot head? Is that why a lot of Republican's that do not want to vote for him ? I remember when Maria Shriver was a reporter in the 2000 or 2004 election, and she went up to him with a mike and he said "get out of my face".

And another time on a t v program,he was introduced to a rescuer when he was a prisoner and he refused to shake the man's hand. I think he is a loose cannon and the party doesn't know what to expect.