<<I am just fascinated with the notion that having a stage to oneself is less advantage to a demagogue , than a face to face challenge.>>
I'm not. When McCain's on his own, he looks weak and pathetic and old. He has to advance his own ideas and they are so obviously bankrupt that it's pathetic. If he has Obama to attack in "debate" he has the option - - don't advance your own idiotic and bankrupt dead-end ideas which even schoolchildren can see through, and your own tired and senile persona - - attack the other guy. "Why don't you wear a flag pin? Why are you betraying our troops?" and these are highly charged emotional issues. So Obama either goes on the defensive ("I DO wear a flag pin, LOOK!" "I'm NOT!!!" "I LOVE our troops." etc.) which makes him look like a wimp and an idiot, or he challenges McSame head-on, "The flag pin's only a cheap symbol! It's for phonies and morons!", which is not going to do him any good. HE CAN'T WIN, FACE TO FACE. Because McCain's a liar and a demagogue, and besides, it looks cruel in public to shame an old man. McSame can whale away at Obama but Obama has to treat the little weasel with respect.
Maybe in a perfect world, a thoughtful, intelligent and insightful candidate could take on an unscrupulous war criminal, liar and demagogue and win a public debate with him, but in the REAL WORLD this just cannot happen. Obama would be nuts to debate McSame, town-hall or otherwise. Especially when his campaign has the momentum and McSame just stumbles from gaffe to gaffe. He's stupid, so he'll fuck up plenty on his own, and meantime Obama gets to craft and hone his own message to perfection.