I remember seeing an episode of the Daily Show in which a debate is set up using Bush recordings in 1999 and 2005, where the each are as different as black and white on key issues. I was shocked to realize just how drastically he had changed.
One could easily arrange the same thing with clips of McCain's different, bizarre incarnations. I can only come to two possible conclusions: either he's aware or he's unaware.
If he's aware, then he's (to used a coined title) a 'flip-flopper' of massive scale. His inconsistency speaks in volume of policies that are not his own but rather a weak reflection of what he believes that his party wants. I would argue that this is actually the better of the two options as it means he could be swayed to do the right thing.
If he's not aware, then he's probably suffering from mild dementia due to his age and a few life experiences. The last thing we need is a man in the oval office who thinks it's 1963 and his kids are playing in the yard.
Needless to say, I'm against McCain. BTW, I'm leaving "Bomb bomb Iran" out of this thread because I get mad even thinking about it.