Democrats have taken control of the US Senate, with millions of voters in two run-off races in Georgia delivering another rebuke to President Donald Trump. Two months after Joe Biden won the White House and Democrats retained the House of Representatives, Republicans suffered the devastating loss of the Senate following one of the richest campaigns in history. And it was a young man, Jon Ossoff, 33, with an Australian-born and bred mother who won the Senate race that handed the keys to the kingdom to Joe Biden. His mum, Heather Fenton, who was born and raised in Sydney. She moved to the US when she was 23.