Let us not get to deep in to Weimar politics, but NSDAP got ellected into the Parliament. For most purposes, considering the time, they actually made their way in to it legaly.Well the Nazis were not voted into power. They were perhaps in a slow-ish decline come 1933 actually, but then Hindenburg's clique decided they had to nominate Hitler chancellor, thiking they could control him. Rest is history.