New Jersey Democratic gubernatorial candidate Barbara Buono is set to introduce her running mate.

Democrat for Goivernor and state Senator Barbara Buono votes in Metuchen (Twitter)

Two Democratic officials told The Associated Press Buono has selected labor leader Milly Silva. The officials insisted on anonymity before Monday's official announcement in East Rutherford.

The 43-year-old Montclair resident is vice president of a private union that represents 7,000 health care and nursing home workers.

The all-female ticket is a first for New Jersey.

Buono and Silva are challenging Gov. Chris Christie and Lt. Gov. Kim Guadagno, who are seeking a second term.

Christie campaign spokesman Kevin Roberts says Buono chose someone who is wholly unqualified to be governor, which is the job's only requirement.

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