I can answer part of your questions regarding the type of influences you might receive if you were a typical factory worker. So specifically as a factory worker you would definitely receive pressure by fellow workers to vote for the Social Democratic Party as they had connections with the unions, and fought to protect worker rights. Also in a typical German town, there were very rigid social divides between people. As such you could typically find artisans, and wealthy families voting for parties on the right side of the political spectrum. For example in a German town called Northeim (book-Nazi Seizure of Power) the town was divide to the point that clubs in the town were divided by class lines. As such you would be heavily influenced to vote SPD since they benefit and appeal to your station in life. However you were still free to vote whoever you wanted; in the 1924 election there was a total of 30 parties. However from 1928-1933 you the situation would change drastically However by the time the Nazis began to increase in activity around 1928 you could definitely feel extreme pressure to vote specific ways. When the Nazis began to become active they would hold, talks and presentations at the local town hall or something similar and have talks on the issues. They would also in several cases hold daily parades, and demonstrations of the SA marching in their uniform. Essentially the closer you get to 1933 the Nazis were increasingly agressive including the SPD. The Nazis performed rallies every week, and the SPD would hold counter rallies. In some towns, there were lists published in Newspapers to not vote for people if they were SPD or if they were Nazis. In several cases in the town of Northeim people were pressured into switching parties. The Nazis also took specific actions of writing letters directly to citizens, and pressuring people at the door to vote Nazi. In situations where the Nazis gained control in towns, people would lose their jobs, if they didn't support the Nazi's. So at the beginning of the Wiemar Republic you had a bit for freedom on voting, however the closer we get to 1933 there was an increase in political activity and pressure to vote. For example the turn out in 1924 was 77.4%, and in 1933 the turn out for the election was 88.74%. A good book to read on the pressure you might face, and if you are curious how the Nazis rose quickly in elections is The Nazi Seizure of Power by William Sheridan Allen.