Quebec 1981

How can Claude Ryan win the 1981 election. In OTL it was a Dewey scenario except he ignored polls instead of obsessing with them :D. The Liberals were more popular than he was. This might butterfly Bourassa (better than PQ, but moved the party to the left). Effects, specifically the 1982 Constitution? My feeling is no signature, but how would the PQ and Liberals develop? Also WI Levesque hadn't resigned in 1985?
 
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