Hudson County has always had a Democratic County Executive.
Bergen went Democratic after William "Pat' Schuber retired in 2002 (Democrat Dennis McNerney beat Henry McNamara), Essex moved to the Democratic column the same year when James Treffinger gave up the post to run for the United States Senate (a campaign that endedfollowing an FBI raid of his offices), and Democrats won Mercer following Robert Prunetti's retirement in 2003; Brian Hughes just narrowly defeated Republican Catherine DiCostanzo.
The last time one party held all County Executive posts was in 1979, when Democratic incumbents were unseated in Atlantic and Mercer.