According to Sen. Sanders, a strong primary challenger for the president may help move back to the left.  With the most recent steps made by the president to put the lefts big three on the table has angered his base.  Senator Sanders answer to this is have a challenge from someone with true progressive agenda.

 

Full article:

http://thinkprogress.org/special/2011/07/22/277124/bernie-sanders-primary-obama/

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