Voters in Newark will pick a new mayor on Tuesday to fill a post held by popular Democrat Cory Booker and steer New Jersey's largest city as it struggles with an uptick in violent crime, unemployment and a possible state takeover of its finances. Booker, who served for seven years as mayor and used his national profile to help attract billions of dollars in investment to Newark, about 12 miles from New York City, is now a U.S. Senator. He won a special election last October to succeed Senator Frank Lautenberg, who died in office. Former City Council President Luis Quintana has held the interim mayorship.