I've posted this several times, and it's a long read, but it's very good: it breaks down Obama and the democrats track record for the last several years, and is a pretty succinct (relatively) outline of how little things have changed, even after the 'monumental' elections of '06 when the D's took control.
http://www.votenader.org/blog/2008/10/29/what-do-they-have-to-do