Why is Ralph Nader the only Liberal Democrat running for President?

http://www.fromthevaultradio.org/home/wp-content/images/FTV066_Meet%20Ralph%20Nader/nader_ralph%2001%20color%20press%20shot.jpg

He is the only one supporting single payer health care....

McCain, Clinton and Obama all support the current Corporatic model with minor modifications that further corporate interest over the citizen.
http://www.reuters.com/article/latestCrisis/idUSN31432035

He is only on attacking the real issues of our economy and loss of libert - Corporatism:
http://consumerist.com/373394/interview-ralph-nader-says-were-living-under-corporate-fascism

McCain, Clinton and Obama are all Corportist supporting the corporate line
http://online.wsj.com/article/SB120709422285181841.html?mod=hps_us_whats_news

Is Ralph Nader is a ture Democrat, and not just armchair quarterback rooting for one TEAM over the other while supporting the current corporate mentality?
http://www.votenader.org/issues/

 

It would certainly seem that he has done more FOR the average citizens of America, thoughout his life, than the other three Corportists put together....