Can you sue a president for breaking a campaign promise?

Hopes&Fears answers questions with the help of experts. We asked law experts if the public has any legal recourse when it comes to a promise an elected official has made when campaigning.
Holocaust expert:
Ben Carson's gun statements have "no relationship with fact"

We talked to Michael Berenbaum about why politicians exploit the Holocaust as a "negative absolute in society," and why Ben Carson's gun comments are "ridiculous."