Nader talks Dem primary challenge 09/20/11 10:49 PMUpdated 04/07/14 02:38 PM Ralph Nader wants someone to primary President Obama. In an exclusive interview with msnbc’s Lawrence O’Donnell the former presidential candidate explains his stance. Plus he offers his thoughts on Twitter as a progressive platform, and tweeps might not like what they hear. Explore:Barack Obama, Democrats and Elections Space, the final frontier... First Word: Monday, October 17 More Like This Best of MSNBC