The Congressional campaign of Mikie Sherrill gained a high-profile supporter on Tuesday: former U.S. Vice President Joe Biden.

Biden characterized Sherrill as a voice for the "middle class" in New Jersey's 11th District, where the U.S. Navy veteran and ex-federal prosecutor is one of the main challengers for soon-to-retire Rep. Rodney Frelinghuysen's seat.

The 11th District encompasses parts of Morris, Essex, Sussex and Passaic counties.