Presidential Pollster Mark Penn on how the alliance between Sen. Bernie Sanders and Rep. Alexandria Ocasio-Cortez affects Former Vice President Joe Biden&apos;s current 30+ point lead. Follow @Mark_Penn_Polls on Twitter and bookmark this page: https://soundcloud.com/markpenn

Do Endorsements Still Matter?

Mark Penn, Presidential Pollster, Stagwell Group President and MDC CEO shares findings from the latest Harvard-Harris Poll, a collaboration between The Center for American Political Studies at Harvard and The Harris Poll. To sign up for regular updates and to learn more about poll results and coverage, visit https://harvardharrispoll.com/, follow @Mark_Penn_Polls on Twitter (https://twitter.com/Mark_Penn_Polls), on Facebook (https://www.facebook.com/MarkPennPolls) and on LinkedIn - https://www.linkedin.com/company/mark-penn-polls/