A Republican gain in a state won comfortably by Mr Biden a year ago would unnerve his Democrats.
Republican Glenn Youngkin has a commanding lead in the Virginia governor's election, widely seen as a referendum on Joe Biden's presidency.
In more potential good news for Republicans in Virginia, their candidate, Winsome Sears, is tipped to become the first black female lieutenant governor of the state, which was the former seat of the pro-slavery Confederacy during the American Civil War.
If he wins Tuesday's vote, Mr Youngkin would be the first Republican elected to statewide office in Virginia since 2009. The McAuliffe campaign tried to liken the challenger to former President Donald Trump, who remains unpopular in Virginia.
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