In every presidential election year after each party's nominee has been selected, much of the attention is focused on the selection of the vice presidential running mate. The common perception is that this person can balance the ticket and help gain votes to win the election. It was not until recently that this position also became a springboard for those with presidential aspirations.

That’s History examines how a running mate influences the vote and how the selection process has changed over time. The Historical Society's collection include the papers of  George Mifflin Dallas, who served as vice president under James K. Polk from 1845-49. Please visit the library at 1300 Locust Street or search our collections online.