The Democratic presidential nominee had a 6-point, 48% to 42% lead among likely voters in the Keystone State, according to the Franklin & Marshall College poll.
Mr. Biden had a 9-point, 49% to 40% lead among a broader pool of registered voters.
The former vice president had held a 7-point, 49% to 42% lead over Mr. Trump among registered voters in a Franklin & Marshall College survey last month.
Mr. Biden held a 5-point lead on who voters said will do a better job keeping communities safe and double-digit leads over the president on who voters trusted to handle the military, foreign policy and race relations.
The former vice president had a 19-point, 50% to 31% lead over Mr. Trump on who voters think has the best plan to handle the coronavirus.
The survey of 635 registered voters was taken from Sept. 14-20 and has a margin of error of plus or minus 6.5 percentage points.
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