Perhaps the trajectory of the political lives of Bill and Hillary Clinton can be understood only through the prism of their personal relationship.

On Thursday's Up to Date, historian William H. Chafe joins Steve Kraske for a look at a team unlike any seen before in American politics. Only by understanding their personal lives as individuals and as a couple, Chafe believes, can we understand the course of their lives in public office.

Later in the hour: Brian McTavish returns with our Weekend To-Do List.