Democrats need a net gain of at least four seats in November’s midterm elections to take control of the United States Senate from Republicans, as voter discontent with President Donald Trump, the Iran war, and rising prices heighten the races in once-safe Republican states.

Republicans currently hold a 53-47 majority, and a Democratic takeover seemed highly unlikely at the start of the year – before the US launched its war on Iran.

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Here are the key races that could decide the control of the Senate:

Alaska

Republican Senator Dan Sullivan is seeking re-election against Democratic former US Representative Mary Peltola and an independent candidate who shares…