In the 1963 election, the Liberals gained one more Member of the Legislative Assembly (MLA), for a total of five, while their share of the popular vote fell to 19.98%. In Perrault's final election as leader in 1966, the party won an additional seat, and a modest increase in the vote to 20.24%.
When the Liberals lost power in the 1979 election, Perrault became Leader of the Opposition in the Senate. He resumed his position as government leader when the Liberals returned to power in the 1980 election. In 1982, he was reassigned to the position of Minister of State for Fitness and Amateur Sport, and served in that position until leaving cabinet in August 1983.
He remained in the Senate until his retirement in 2001.
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