Exit polls - live updates: First midterm election results in with two House seats flipping to Democrats
The first indications of one of the most important elections in US history are arriving as exit polls are revealed.
They will offer the first clues as to how the historic night will work out for Donald Trump, as Democrats battle to take control of Congress.
Exit polls target important seats and ask people how they intend to vote as they leave. By working out how those indications could play out across the country, pollsters can understand how the small number of important seats could fall.
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