There is now a site setup in which you can sign a petition to demand that the political canidates running for President of the United States of America, debate this cominf Friday, September 26, 2008 in Mississippi as previously scheduled.  The web site states:

Demand that Senators Obama and McCain both show up in Mississippi on Friday night and debate for 
the American people.  In this time of crisis, we need to hear from our leaders, not let them hide 
in Washington.  Now more than ever, we need an open dialogue with our leaders.

I demand the debate!

Source.