Where the US midterm elections will be won and lost
Americans head to the polls on 3 November to decide how the rest of Donald Trump's presidency will play out.
Thousands of races are taking place across the US, at different levels of government. But the main event for voters will be electing members of the House of Representatives and the Senate, the two chambers that make up Congress.
Both of them are currently controlled by the Republicans, the president's party. The success or failure of Trump's final two years in office could rest on the outcome.
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