Question: The 17th Premier of Nova Scotia and leader of the federal Progressive Conservative Party of Canada Robert Stanfield fought a few times and lost in general elections against which politician who is currently one of the longest-serving Prime Minister in Canadian history?
Sentence (from "William Cox (Nova Scotia lawyer)"): (May 13, 1921 – October 8, 2008) was a Canadian lawyer, practising in Halifax, Nova Scotia.
Relevant evidence: No