More Democratic than Republican candidates won in the 1968 United States gubernatorial special elections.
A by-election, also spelled bye-election, and also known as a special election (United States, the Philippines) or a bypoll (India), is an election used to fill an office that has become vacant between general elections. United States gubernatorial elections were held on 5 November 1968, in 21 states and one territory, concurrent with the House, Senate elections and presidential election. 
