The 1992 gubernatorial election, pitting John Odigie Oyegun (the SDP candidate) against Lucky Igbinedion (the NRC candidate) was annulled on February 4 of that year by the electoral tribunal. Among Igbinedion's claims were that the Oba of Benin and one of his chiefs, Nosakhare Isekhure, unfairly supported Oyegun. Oyegun's victory was upheld on March 18, 1992.
On March 20, 2008, an election tribunal nullified the election of Oserheimen Osunbor People's Democratic Party, and declared erstwhile labour leader Comrade Adams Oshiomhole of the Action Congress as the winner. The decision was based on several voting irregularities.