The Last Word with Lawrence O'Donnell 08/03/15

Trump leads 3 latest polls before 1st debate

Donald Trump has a commanding lead over his Republican rivals in new polls 3 days from the first 2016 GOP debate.  What's behind Trump's surge? And which Republican hopefuls will make the debate stage?  Lawrence talks with Joy Reid, Howard Dean, & Robert Costa. ... more Duration: {{video.duration.momentjs}}