‘Enough!’: Sanders calls on Democrats to stop infighting and back Biden POLITICOOpinion | Bernie Sanders: Joe Biden for President The New York TimesBernie Sanders endorses Biden in NYT essay, tells doubters to stop trying to replace him: ‘Enough! Fox NewsBernie Sanders backs Biden in New York Times essay: ‘He must win’ USA TODAYBernie Sanders Warns Democrats Against Biden ‘Firing Squad’ The Daily Beast