The US will go to the polls on Tuesday in decisive US midterm elections, a key test for US President Joe Biden and the governing Democrats as the Republicans look to take control of Congress. Biden has warned Americans that the election, which comes in the middle of the president’s term in office, will shape the US “for decades”. The midterms will decide all the seats in the House of Representatives and one-third of the Senate, which collectively make up the Congress, currently controlled by the Democrats. A Republican resurgence threatens to upset the Democrats’ hold on power and lead to a po…