A left-wing advocacy group released a survey in April demonstrating that black voters could cost Joe Biden the nomination — once they are familiar with his record.

Data for Progress’s memo on “Joe Biden’s Electability” tests the assumption that the former vice president is the Democrats’ best chance for winning back the White House in 2020. The group surveyed 1,309 voters on their opinions of Biden before and after reading a number of statements critical of his record as vice president and senator.