Political campaign badges (buttons) have been used in the US for over 100 years according to this post. I posted an blog article about an early patent in the 1890's for a pin-badge.

This post by Meg Miller describes how Hillary Clinton has organised the Forty-Five Pin Project, asking 45 famous  designers to create one design each for her campaign.

The link to Meg Millers article

See my earlier blog article about Australian Political badges.