Question: When was the political party, of which David Lewis was national secretary, founded ?

<P0-S0> The 1975 New Democratic Party leadership election, was held in Winnipeg, from July 4 to 7 to elect a leader of the New Democratic Party of Canada. <P0-S1>  David Lewis retired as federal leader, and Ed Broadbent was elected as his successor. <P0-S2>  Rosemary Brown made the first attempt by woman-of-colour to run for leader of a major recognized Canadian political party. <P0-S3>  She came in second. <P0-S4>  Broadbent led the NDP to its greatest electoral successes to then, including the historic 43 seats in the House of Commons in 1988. <P0-S5>  This convention marked the beginning of fourteen years of party unity and stability that allowed it to reach its best electoral performances of the 20th century. <SEP> <P1-S0> John David Lewis (March 17, 1955 – January 3, 2012) was a political scientist, historian and Objectivist scholar who held the post of visiting associate professor in the Philosophy, Politics and Economics Program at Duke University from 2008 to 2012, as well as Associate Professor of Business at the University of North Carolina at Chapel Hill. <P1-S1>  Lewis was also an Anthem Fellow for Objectivist Scholarship. <P1-S2>  Lewis received his PhD in classical studies at Cambridge University in 2001, with the dissertation, "Solon’s Polis as Kosmos: Intellectual, Moral and Political Integration in Archaic Athens". <P1-S3>  He taught at the University of London from 2000-2001. <P1-S4>  From 2001 to 2008, he was a professor in the History and Political Science Department at Ashland University, where contention surrounding his promotion to tenured professor drew national attention. <P1-S5>  Lewis was a member of the American Political Science Association, the Association of Ancient Historians, the Society for Military History, the American Philological Association, and the Cambridge Philological Society. <P1-S6>  Lewis published three books, was a contributing editor to "The Objective Standard" and contributed to "Capitalism Magazine" and contributed to multiple publications including "Journal of Business Ethics", "Social Philosophy and Policy", "Polis", "Dike", and "Bryn Mawr Classical Review". <P1-S7>  Lewis frequently spoke at Objectivist conferences and Tea Party events. <P1-S8>  He also spoke on the morality of free markets in medicine, arguing that innovators ought to be freed from unnecessary regulation. <P1-S9>  Lewis died on January 3, 2012 after a long battle with cancer. <P1-S10>  He was 56. <SEP> <P2-S0> The Co-operative Commonwealth Federation (CCF) (French: "Fédération du Commonwealth Coopératif" , from 1955 the "Parti social démocratique du Canada ") was a social-democratic and democratic socialist political party in Canada. <P2-S1>  In 1944, the CCF formed the first social-democratic government in North America when it was elected to form the provincial government in Saskatchewan. <P2-S2>  The CCF was founded in 1932 in Calgary, Alberta, by a number of socialist, agrarian, co-operative, and labour groups, and the League for Social Reconstruction. <P2-S3>  In 1961, the CCF was succeeded by the New Democratic Party (NDP). <P2-S4>  The full, but little used, name of the party was Co-operative Commonwealth Federation (Farmer-Labour-Socialist). <SEP> <P3-S0> David Lewis, {'1': ", '2': ", '3': ", '4': "} (born David Losz; June 23, or October 1909 – May 23, 1981) was a Canadian labour lawyer and social democratic politician. <P3-S1>  In 1962, he was elected as the Member of Parliament (MP), in the Canadian House of Commons, for the York South electoral district. <P3-S2>  While an MP, he was elected the NDP's national leader, and served from 1971 until 1975. <P3-S3>  After his defeat in the 1974 federal election, he stepped down as leader and retired from politics. <P3-S4>  He spent his last years as a university professor at Carleton University, and as a travel correspondent for the "Toronto Star". <P3-S5>  In retirement, he was named to the Order of Canada for his political service. <P3-S6>  He was national secretary of the Co-operative Commonwealth Federation (CCF) from 1936 to 1950, and one of the key architects of the New Democratic Party (NDP) in 1961. <P3-S7>  After suffering from cancer for a long time, he died in Ottawa in 1981.