From Monmouth University Polling:
One-third (32%) of Americans continue to believe that Joe Biden’s victory in 2020 was due to voter fraud – a number that has not budged since the November election.
At first glance in the crosstabs, it looks like the number of “Republicans” who believe this has been trending down while the number of independents who agree has ticked up.
However, this appears to be a product of a shift in how Republicans identify themselves, with some moving their self-affiliation from being partisan to being an “independent” who leans partisan.
When all Republican identifiers and leaners are combined, the number who believe Biden won only because of voter fraud has been fairly stable (63% now, 64% in March, 69% in January, and 66% in November).
Furthermore, 14% of the American public say they will never accept Biden as president, including 3 in 10 (29%) Republicans and Republican leaners.