Vermont Sen. Bernie Sanders suggests its time for Obama to face primary challenge

After a nearly trillion-dollar federal stimulus, historic health care reform legislation and two confirmed liberal Supreme Court justices, one might think the American left would have to be somewhat satisfied with President Barack Obama, at least as a presidential nominee.

But Independent Vermont Sen. Bernie Sanders is not. In an interview with liberal talker Thom Hartmann on Friday, Sanders spoke out very aggressively about the possibility of Obama facing a challenge from his left for the Democratic nomination.