The Last Word with Lawrence O'Donnell 10/06/15

Will bad attendance be Rubio’s Achilles heel?

Republican rivals are now taking aim at another candidate who’s poll numbers are improving: Marco Rubio. Will attacks from Donald Trump and Jeb Bush stop Rubio’s rise or will he be a true challenger? Maria Teresa Kumar, Sam Stein, and David Frum join. ... more Duration: {{video.duration.momentjs}}