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Booker's campaign announced Tuesday that the vice president will not appear at a Friday event for the candidate in New Jersey.

Biden had planned to make a stop in the state to help boost Booker's campaign just five days before Election Day. Though the Democrat is still favored in the special election to replace deceased Sen. Frank Lautenberg (D-N.J.), multiple polls in recent weeks have shown his Republican opponent, Steve Lonegan, to be closer than expected.

Biden has already hit the trail for other candidates this cycle, making a stop in Massachusetts for then-candidate Edward MarkeyEdward (Ed) John MarkeySenate Democrats introduce bill to block Trump's refugee ban FCC votes to limit program funding internet access for low-income communities Two GOP senators oppose Trump’s EPA chemical safety nominee MORE (D). He also has a fundraiser planned for Sen. Kay HaganKay HaganPolitics is purple in North Carolina Democrats can win North Carolina just like Jimmy Carter did in 1976 North Carolina will be a big battleground state in 2020 MORE (D-N.C.) later this month.