In 1968, Richard Nixon ran on a platform for the presidency that included a "secret plan" to end the war in Vietnam.

Find out the history behind the nastiest campaigns in history.

While this year’s election may seem like the nastiest campaign in political history, historian David Eisenbach looks back at our nation's other political mudslinging matchups.

Presidential historian Doris Kearns Goodwin looks at how Abraham Lincoln and Franklin Roosevelt grew as presidents from listening to people with views different than their own.