It’s too simple to say that “The Grapes of Wrath” and “On the Waterfront” are political bookends. Like all good works of art, they defy easy categorization. But they show how political outrage can ignite a story and arouse an audience — an especially worthy reminder this week, given Tuesday’s presidential election and the debut of Steven Spielberg’s much-hyped “Lincoln” opening at Kendall Square on Friday.
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