WFB- The former Democratic presidential candidate appeared on  The Late Show With Stephen Colbert,  where he discussed the 2016 election and Clinton s new book What Happened, which delves into her devastating defeat at the hands of Trump.Colbert questioned Sanders about Clinton s claim that he caused  lasting damage  to her campaign during the primaries through his attacks against her.Next, Sanders hit Hillary right between the eyes when he reminded her how she lost to the candidate that the left never imagined could beat her Look, Secretary Clinton ran against the most unpopular candidate in the history of this country, and she lost,  Sanders said.  And she was upset about it. Now, I understand that. Our job now is really not to go backwards, it is to go forwards,  Sanders said.  And I think it s a little bit silly to be keeping talking about 2016. We got too many problems. 