More to explore:
Here are some campaign buttons from Richard Nixon's failed presidential campaign in 1960.
Abraham Lincoln Campaign Button, 1864
Vintage campaign button
I'd love to have this campaign button.
Vintage campaign button: FDR and John Nance Garner
Retro campaign button
Lincoln campaign button
An interesting collection of political campaign buttons from the 1940's through 2008. They manage to say so much with their simple messages.
Taft Campaign button