In January, Cory Booker was heckled at a health reform event he did. These were protestors from the left who were upset about his vote against the Klobuchar-Sanders amendment to allow drug imports from Canada. Booker offered to meet with the hecklers after the event was over, and looks like a portion of that meeting was taped without his knowledge, and that tape has now been released by one of the protestors:
http://www.realprogressivesusa.com/news/post/2017-06-07-cory-bookerhttps://www.youtube.com/watch?v=IgHQzmDUp9Q&feature=youtu.be&aNote his digs at Sanders at around the 9 minute mark.