The admission Thursday from the Prince William County Office of Elections comes a week after prosecutors from the Virginia Attorney General's office dropped charges against the county's former registrar, Michele White.
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In the presidential race, the county mistakenly shorted Biden by 1,648 votes, and overreported Trump's count by 2,327 votes.
The 3,975-vote error in the margin of victory was immaterial in a contest that Biden won by 450,000 votes in Virginia and by more than 60,000 votes in Prince William County.
In the U.S. Senate race, Democrat Mark Warner was shorted by 1,589 votes and Republican Daniel Gade was shorted by 107 votes.
And in a U.S. House race, Republican Robert Wittman was shorted by 293 votes.
Virginia's most recent redistricting has dramatically reduced the number of split precincts that caused Prince William County problems in 2020. »