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Americans are going to the polls today to cast their votes in the presidential election today and millions around the world will be closely following the results as they come in overnight.
What better way to prepare than by listening to Professor Adam Smith, Director of the Rothermere American Institute, on the BBC World Service?
He gives the long view on the office of the presidency and explains how it has evolved over time since the Framers wrote the Constitution.
You can listen on the BBC iPlayer from 17 minutes 30 seconds: https://www.bbc.co.uk/sounds/play/w3cszkpr