It’s already been called the most important civil rights film of the decade, but only time will tell if Milk has any real impact on the gay marriage issue or any other related civil rights matter. Obviously the film, which is set thirty years in the past, can be appropriated by the campaign to overturn Proposition 8, but if that campaign is successful, it will be difficult to prove with certainty Milk contributed to the end result.

The Birth of a Nation may have inspired a reformation of the Ku Klux Klan and Guess Who’s Coming to Dinner may have opened some minds to wider acceptance of interracial marriage (which had just recently been legalized). However, as Time magazine reported earlier this year, it’s quite rare for cinema to really change the world. A movie like Philadelphia easily gets moviegoers thinking about AIDS and discrimination, for instance, and Sicko exposes some of the supposed benefits of universal health care, yet most of these kinds of message films preach primarily to the choir.

But at least five films have made an actual difference, either on a local or national level. Will Milk join the small group of movies detailed below?
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