The Morning Consult poll of 4,035 likely voters, taken Friday, found the former vice president leading Trump 50-44 percent. The poll had a two-point margin of error.
But on Aug. 23, Biden’s lead was in the double digits: 52 percent to 42 percent for the incumbent.
Suburbanites accounted for the biggest shift. They sided with Biden by a 14-point margin in the same survey last week — before the Republicans hammered voters with a law-and-order message in recent days.
Post-convention, suburban support for Biden dropped by six points, the poll found.
