Jon Bon Jovi campaigns with Hillary Clinton in Newark

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Hillary Clinton stands on stage with Jon Bon Jovi during a campaign stop at the Newark campus of Rutgers University, June 1, 2016, in Newark, N.J. (AP)

NEWARK, N.J. (AP) — Democratic presidential candidate Hillary Clinton received an assist from New Jersey rocker Jon Bon Jovi on Wednesday at a rally in advance of the state's primary next week.

The performer joined Clinton at a campaign event at the Rutgers University campus in Newark. Democratic U.S. Sen. Cory Booker, the city's former mayor and a vocal Clinton supporter, also participated.

Bon Jovi said he has known Clinton for more than 20 years and, after listing her various professional titles, likes to refer to her as "Mrs. C."

"I hope we'll soon be calling her Madam President," he told the crowd of about 300 in the school's gymnasium.

Clinton faces U.S. Sen. Bernie Sanders of Vermont in next Tuesday's state primary.

Booker extolled Clinton's performance as secretary of state and took a few shots at presumptive Republican nominee Donald Trump, calling him "probably the least presidential person that has ever been put up for office" and "one of the greatest fear-mongers that's ever run for president of the United States."

Bon Jovi has been a Clinton supporter but also donated $5,400 to New Jersey Gov. Chris Christie's failed bid for the Republican presidential nomination.

The performer of hits such as "Livin' On A Prayer," ''You Give Love A Bad Name" and "Wanted Dead Or Alive" also was scheduled to take part in a fundraiser for Clinton in Boston on Wednesday evening.