 President Biden's campaign has picked up the endorsement of Bernie Sanders, who calls on American voters to not let Donald Trump back in the White House. Lisa Carton has more. Senator Bernie Sanders called on Democrats to stop their bickering and nitpicking over his candidacy. In an opinion piece published in The New York Times on Saturday, the Vermont independent defended Biden's decision to remain in the race. He also pledged to do all that he can to see that the 81-year-old Biden is reelected.