The Manchurian Candidate (2004) written by Dean Georgaris and Dave Payne. We wish this was the 1962 version, but what can you do.
All the President’s Men by William Goodman. Not specifically about an election, but it’s all related.
Election by Alexander Payne and Jim Taylor. Reese Witherspoon at her best.
Napolean Dynamite by Jared Hess and Jerusha Hess. Your mom goes to college.
Mr. Smith Goes to Washington by Sidney Buchman. Does it get any better?
Wag the Dog by David Mamet. Bringing to together the corruption of Washington and the creativity of Hollywood.