Turnout in Passaic County, Mr. Pascrell's base, was higher than in Mr. Rothman's base in Bergen County in early returns.

WSJ: N.J.'s Pascrell, Payne Score In Primaries

While the Essex County Democratic Party hasn't made an endorsement, Passaic County Chairman John Currie said he has been impressed by Mr. Alexander and thinks Ms. Gill could be more "active" in her service to Clifton.

WSJ: Ex-Obama Aide Makes Bid in N.J.