Born in Old Barns, Nova Scotia, he was elected to the Canadian House of Commons for the Nova Scotia riding of Shelburne and Queen's in the 1911 election as a Conservative. He was re-elected in the 1917 election for the riding of Colchester as a supporter of Sir Robert Laird Borden's Unionist government.
In 1916, he was one of the first parliamentarians to be appointed a Parliamentary Secretary, when he was appointed Parliamentary Secretary of Militia and Defence for Sam Hughes. He was also the Parliamentary Secretary of Soldiers' Civil Re-establishment. Upon his appointment to Borden's Cabinet in 1920 as Minister of Public Works he was required by the law of the time to resign his seat and run in a by-election. By this point it was customary for Cabinet ministers running in by-elections to be acclaimed however, the newly formed United Farmers party contested the by-election with a United-Famers/Labour candidate. McCurdy opted to face this challenge by running as a Nationalist Liberal rather than as a Conservative and was re-elected, though narrowly. It is possible he chose this banner as the Unionist Party had formally changed its name to the National Liberal and Conservative Party by this time or as a means of facing down the threat from a left-wing candidate. In any case, Blanchard ran the following year in the 1921 election as a Conservative and was defeated.