Whicher served in World World War II with the 4th anti-tank regiment of the Canadian military. Following the war, he returned home and opened the Wiarton Dairy, operating it for several decades. In 1958, he was a candidate for the leadership of the Ontario Liberal Party, but received only 39 votes and dropped off after the first ballot at the party"s leadership convention.
He was re-elected to the legislature in 1959 and 1963 and served as the Liberals" finance critic.
During this period, the Progressive Conservative government of John Robarts was often to the left of the Liberals, and Whicher often criticised it for overspending. He retired from politics when the 1974 election was called.