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Donald Trump or Hillary Clinton? It's still a month until the US Republican and Democrat parties formally nominate their presidential candidates, but this is all but certain to be the choice for Americans in November. Sarah Montague speaks to political consultant and pollster Frank Luntz, who has spent his career listening to how Americans think and feel about politics and politicians. He thinks that voters are angrier than ever before, and that the fracturing of the right and left in American politics means that any outcome is possible.