David George Hahn was a Liberal party

Liberal Party of Canada

The Liberal Party of Canada , colloquially known as the Grits, is the oldest federally registered party in Canada. In the conventional political spectrum, the party sits between the centre and the centre-left. Historically the Liberal Party has positioned itself to the left of the Conservative...

 member of the Canadian House of Commons

Canadian House of Commons

The House of Commons of Canada is a component of the Parliament of Canada, along with the Sovereign and the Senate. The House of Commons is a democratically elected body, consisting of 308 members known as Members of Parliament...

. He was a businessman by career.

He was first elected at the Broadview

Broadview (electoral district)

Broadview was a federal electoral district in Ontario, Canada, that was represented in the Canadian House of Commons from 1935 to 1979. This riding was created in 1933 from parts of Toronto East and Toronto—Scarborough ridings....

 riding in the 1963 general election

Canadian federal election, 1963

The Canadian federal election of 1963 was held on April 8 to elect members of the Canadian House of Commons of the 26th Parliament of Canada. It resulted in the defeat of the minority Progressive Conservative government of Prime Minister John Diefenbaker.-Overview:During the Tories' last year in...

, after an unsuccessful attempt to win the riding in 1962

Canadian federal election, 1962

The Canadian federal election of 1962 was held on June 18, 1962 to elect members of the Canadian House of Commons of the 25th Parliament of Canada...

. After his sole term in federal office, the 26th Canadian Parliament

26th Canadian Parliament

The 26th Canadian Parliament was in session from May 16, 1963 until September 8, 1965. The membership was set by the 1963 federal election on April 8, 1963, and it changed only somewhat due to resignations and by-elections until it was dissolved prior to the 1965 election.It was controlled by a...

, he was defeated in the 1965 election

Canadian federal election, 1965

The Canadian federal election of 1965 was held on November 8 to elect members of the Canadian House of Commons of the 27th Parliament of Canada. The Liberal Party of Prime Minister Lester B. Pearson was re-elected with a larger number of seats in the House...

 by John Gilbert

John Gilbert (Canadian politician)

John Gilbert was a Canadian lawyer, politician and jurist.Gilbert was born in Toronto and grew up in a poor working class family which he helped support during the Great Depression by selling newspapers at the corner of Yonge and Bloor for two cents each and by gathering coal that had fallen off...

 of the New Democratic Party

New Democratic Party

The New Democratic Party , commonly referred to as the NDP, is a federal social-democratic political party in Canada. The interim leader of the NDP is Nycole Turmel who was appointed to the position due to the illness of Jack Layton, who died on August 22, 2011. The provincial wings of the NDP in...

.

Hahn briefly served as Parliamentary Secretary to the Minister of Industry in 1965, from July to September.