(Michael Sohn | AP File Photo) In this April 6, 2019 photo, former President Barack Obama attends a town hall meeting at the 'European School For Management And Technology' (ESMT) in Berlin, Germany. Obama warned the Democratic field of White House hopefuls not to veer too far to the left, a move that he said would alienate those otherwise open to voting for the party’s nominee next year. Obama did not mention anyone by name.