Tom Roston gives his review of "Caucus," a documentary premiered at Hot Docs this year which follows the 2012 Republican campaign trail through Iowa.

POV now has four great feature-length documentaries streaming for free on its website: Scout's Honor, Granito: How to Nail a Dictator, When the Mountains Tremble, and A Perfect Candidate.

Tom Roston talks with filmmaker David Van Taylor about his new documentary series To Tell The Truth which aims to cover the evolution of documentary while connecting a broader audience to the genre.

A state-by-state breakdown of the best, most representative and most unique documentaries from the 50 states and Washington, D.C.