Newark Mayor Cory Booker
Newark Mayor Cory Booker speaks during day one of the Democratic National Convention at Time Warner Cable Arena on September 4, 2012 in Charlotte, North Carolina. The DNC that will run through September 7, will nominate U.S. President Barack Obama as the Democratic presidential candidate. (Photo by Streeter Lecka/Getty Images)

NEWARK, N.J. (AP) — Oprah Winfrey is holding a fundraiser for Democratic Newark, N.J., Mayor Cory Booker’s bid for the U.S. Senate.

Tickets for Thursday’s event in Jersey City range from $1,000 to $2,600. Booker’s campaign says about 200 people are expected to attend.

Winfrey dubbed Booker a “rock star mayor” on her show, and the two are friends.

Facebook founder Mark Zuckerberg announced his $100 million gift to Newark’s schools when he and Booker appeared on Winfrey’s TV show in September 2010.

Polls show Booker is the front-runner in the race to replace the late Democratic Sen. Frank Lautenberg (LOW’-tuhn-burg), who was the oldest member of the Senate and died last month at age 89. The primary election is scheduled for Aug. 13.

Copyright 2013 The Associated Press.