Newark hit the jackpot with a $100 million donation from the Facebook founder to aid its ailing schools. Now the country will be watching for results—and mistakes.

This year, Mr. Christie, the blunt-speaking suburban white Republican, and Mr. Booker, the Scripture-quoting urban black Democrat long rumored to want the governor’s job, have become the state’s political odd couple.

NEWARK, N.J. — Cory Booker has handily won a second term as mayor of Newark, a New Jersey city that has struggled with gun violence.