He has a record of achievement on behalf of the public.
None of the achievements were big enough to justify jumping to the presidency.
His proposals are different from any of the major party candidates. He's the only one that will stand up to corporations.
TwilightJack
Edwards was also ready to stand up to corporations, and he was from a major party.
RobComptonForObama
A three party system would be healthy for the democratic process. Adding a 3rd element would ease tension and sponsor debate over partisan bickering.