Mark Penn, chief strategist for Hillary Clinton's presidential campaign, stepped down Sunday. Penn quit the campaign after it was revealed that he met with a Colombian diplomat about passing a free trade deal that Sen. Clinton opposes.
NPR's Mara Liasson tells Renee Montagne that Penn, the chief executive of public relations giant Burson-Marsteller, has been "a walking, talking political conflict of interest" for some time.
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