Stephane Dion, the former environment minister who was unexpectedly elected leader of Canada’s opposition Liberals, on Sunday tried to heal splits in his party by reaching out to the many legislators who did not support him. Dion, who ran on the need to protect the environment, came into a Montreal leadership convention trailing in fourth place. But after making a strong speech and deftly striking deals with former opponents, he handily beat former Harvard academic Michael Ignatieff in the final ballot on Saturday.