Early indications suggest a neck-and-neck race to control the Senate after midterm results begin to filter in, with many knife-edge races yet to be called.
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Democrat John Fetterman clung onto the Pennsylvania Senate race against Dr Mehmet Oz, while Florida Governor Ron DeSantis romped home by almost 20 points in Florida.
Arizona, Georgia and Nevada remain in play for the Senate race - which could require a deciding vote from VP Kamala Harris if it ends in a dead heat.