 Bauer wrote of the main parties of the Weimar Coalition that dominated German politics until 1930, the leftist SPD and the liberal DDP were opposed to anti-Semitism while the right-of-the-centre Catholic "Zentrum" was "moderately" antisemitic.Bauer wrote of the major pre-1930 political parties, the only party that could be described as radically antisemitic was the conservative German National People's Party, who Bauer called "... the party of the traditional, often radical anti-Semitic elites..." who were "... a definite minority" while the NSDAP won only 2.6% of the vote in the "Reichstag" elections in May 1928.Bauer charged that it was the Great Depression, not an alleged culture of murderous anti-Semitism that allowed the NSDAP to make its electoral breakthrough in the "Reichstag" elections of September 1930.