Although Trump retains his lead in the election’s battleground states, all of them show a swing towards Mr Biden, Axios reports.
However, in a further reversal from the early months of the race, Trump has now raised more money than his rival, after his conviction spurred donations to his campaign.
In the seven battleground states, polling shows a swing of at least 1.1 per cent towards Mr Biden since Trump was convicted at Manhattan Criminal Court in New York.
The Democrat appears to be heading for victory in two of the states: Michigan and Wisconsin, where he has a 0.5 per cent lead in both.
In Michigan, polling averages show that Trump had a 1.1 per cent lead on May 30, which was cut in half the day after his conviction and gradually evaporated over the following weeks.
Swing state polling, as it stands, suggests the Republican would claim more than 270 electoral college votes and win the election.
However, it gives Mr Biden, who now brands his rival a “convicted felon”, some much-needed momentum less than five months away from polling day.