Presidential Debate Winner

As I see it, even if a debate is rated as a tie, Kerry wins. Everybody knows the President from seeing him the last 4 years. Not many know Kerry. The undecideds have already determined they are unhappy with Bush and what he's done, but are still unsure about Kerry because they don't know him. The more unfiltered viewing they get of Kerry, the more they get to know him. Which is good for Kerry, unless he makes an ass of himself, which he certainly has not done. In fact, general concensus is that he won both debates, the first by a wider margin.

I think the debates are a great thing because of the unfiltered view we get of both candidates. What I don't know is why any incumbent would agree to them.