John McCain is a loose cannon. He has always been a loose cannon. He will always be a losse cannon. For those not familiar with that phrase, it refers to something that happened on early sailing warships. The cannons had to be lashed in place, because otherwise they would run on their wheels from side to side in bad weather, stove out the sides of the ship and sink it.
The saving grace of this story is that Kerry would earn such enmity from other Democrats for allowing a Republican to parachute into the Veep job that he would never consider it. So, chalk this story up to McCain shooting from the lip, no more, no less. It has no relevance in the real world.
John / Billybob