Here is an interesting piece by a journalist about her "confrontation" with McCain. She ends it with these thoughts (thanks to www.mittreport.com for the scoop):

Suddenly, with McCain out of the room, the debate in the room shifted away from Iraq and onto McCain's temper - with the consensus being summed up by Anatol Kaletsky of the London Times: "It appears that his short fuse will become a problem for him during the campaign."

Indeed, if he loses his temper over being called out for marginalizing opposition to Iraq as "far left" (the hoariest of GOP talking points), this is going to be a really long campaign trail for John McCain - offering anyone with a cellphone camera endless opportunities to make their mark on YouTube.