Obama, McCain Debate Via Twitter
blog.twitter.com/2008/06/obama-mccain-debate-via-twitter.html
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Silicon Alley Insider has the details: "Want to know what Barack Obama thinks about net neutrality? John McCain's views on white space spectrum? Good luck learning about that during any of this fall's official debates. But we're reasonably sure these and other issues will come up via a semi-formal debate the two campaigns are starting up today -- via Twitter."