The elections took place midway through the first term of Governor Richard J. Hughes. Eleven of New Jersey's 21 counties elected Senators; Republicans gained four seats.
Incumbents not running for re-election
Democratic
Donal C. Fox (Essex) (lost support of county organization)
Republican
All five Republican incumbents stood for re-election.
The campaign was bitter, with Hulse criticizing Haines's record in the Senate. Haines was aligned with Grover C. Richman Jr., the former Attorney General whom Governor Hughes had outmaneuvered for the 1961 Democratic nomination.[2]