Vice President Joe BidenJoseph (Joe) Robinette BidenDemocrats will need to explain if they shut government down over illegal immigration Trump thinks he could easily beat Sanders in 2020 match-up: report Biden marks MLK Day: Americans are 'living through a battle for the soul of this nation' MORE will campaign for Democratic Senate candidate Cory Booker just five days ahead of Election Day.

Biden will hit the trail for Booker in New Jersey on Oct. 11. The Newark mayor is leading in every poll of the race, but the most recent survey showed his lead over Republican Steve Lonegan dropping to just 12 points, from more than 20 points in most preceding polls.

Still, Booker is the heavy favorite to win in the deep-blue state.

Biden has acted as closer in campaigns before, most recently making a similar last-minute campaign stop for Sen. Edward MarkeyEdward (Ed) John MarkeyDemocrats search for 51st net neutrality vote Overnight Regulation: Dems claim 50 votes in Senate to block net neutrality repeal | Consumer bureau takes first step to revising payday lending rule | Trump wants to loosen rules on bank loans | Pentagon, FDA to speed up military drug approvals Dems say they have 50 votes in Senate to overrule net neutrality repeal MORE (D-Mass.) shortly before his win in the Massachusetts Senate special election.

Markey was facing slightly tighter polls but a similarly favorable atmosphere in Democratic Massachusetts, and won by ten points on Election Day.