Here are two trays of political buttons from 1896 presidential race. The major party candidates were William McKinley and William Jennings Bryan. The first patents were filed in 1894, but the button hit its stride during the 1896 campaign. William McKinley and other Republicans. William Jennings Brayan and other Democrats If any of these pieces look interesting, I can post a lot more information about them.
I can post similar boxes for all presidential campaigns from 1900 to 2000. I have been too upset with recent elections to collect them.