Thompson replace John Wintermeyer who resigned after losing his seat in the 1963 provincial election.
The leadership convention was held to replace John Wintermeyer who resigned after losing his seat in the 1963 provincial election.
In addition Victor Copps, the mayor of Hamilton, Ontario, Joe Greene a federal MP and Charles Templeton, a popular Toronto evangelist and preacher also entered the race.
Andy Thompson had recently attained notoriety for speaking out against Attorney General Fred Cass's "police bill" and was seen as a leading candidate.
Thompson would last only two years as leader before resigning due to stress induced health problems.