Debate descends into melee over health care, Obama, socialism as Dems struggle to show unity

Long-simmering policy disputes between Joe Biden, Bernie Sanders, Elizabeth Warren and a slew of other candidates exploded into the open during Thursday night’s Democratic primary debate, as the candidates — often with raised voices — laid bare their fundamental disagreements on “Medicare-for-all,” immigration and more. Intermittent efforts by some candidates to show unity and keep the heat on…