Political scientists and political film buffs need to watch The Candidate. It's one of the greatest classic political films ever made. I've studied dozens of political campaigns, conducted mock elections during my undergraduate and graduate courses, and volunteered for real campaigns when I was old enough. This movie is very realistic; the only other film that comes close in realism is 2015's Our Brand is Crisis.
Peter Boyle is a Democrat campaign manager, and in the California Senate election, the Republican sitting senator Don Crocker is a shoe-in. Whoever the Democrat candidate is doesn't stand a chance, so no one wants to ruin their career that way. Boyle approaches Robert Redford, the son of former Californian governor Melvyn Douglas. He's handsome, charismatic, and has name recognition—but he's a guaranteed loss so there's no consequence to anything he says or does. With the freedom to run as an honest politician, he becomes a very interesting and alluring candidate.
Even though the movie is about an election, it doesn't take too much of a stand about which party is right and which is wrong. Yes, it's the 1970s and Robert Redford is the lead, so there will be some environmental and "look out for the little guy" messages, but mostly, the film comments on the politics in general. It's really funny and sarcastic in the nicest way possible, and it has one of the most memorable last lines ever!