He was a member of the Christian Social Party before World War I, and thereafter of the Citizens’ Party.
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Both De Winter and Leemans served as a senators for the centre-right Christian Social Party (PSC-CVP) and Leemans ended his career as President of the European Parliament.
Afterwards the party, which furthermore lost votes as Germans moved from rural areas to new industrial centers in the west (Ostflucht), forged an electoral alliance with the Christian Social Party under Adolf Stoecker.
The prize is named after the Austrian politician Leopold Kunschak (1871–1953) of the Christian Social Party of Austria.
For example, in 1888, her palace was the site of a meeting of politicians who would eventually found the Christian Social Party; that meeting was attended by, among others, Karl Lueger and Karl Freiherr von Vogelsang.