The poll also found Biden with a 16-percentage-point advantage (55%-39%) over Sanders among registered Democrats and independents who lean Democratic.
June 2 has officially become the second-biggest day for allocating delegates of the entire 2020 Democratic primary cycle, behind March 3.
His aides are moving deliberately to address his biggest liability: An enthusiasm deficit among the liberal base, especially young voters.
Joe Biden should more forcefully rebut President Trump, whose daily updates on the coronavirus give him precious media coverage.
The Democratic frontrunner faces an unprecedented political challenge as he seeks traction while working from home * Coronavirus - live US updates * Live global updates * See all our coronavirus coverageVideo conferences from a basement, glitchy internet and bouts of restlessness. Joe Biden, like