Even as some Republican Congressmen have indicated that they may join the Democrats in bringing articles of impeachment against US President Donald Trump, it would be wrong to see the problem of extreme polarisation in US politics receding because of the shock over the attack on Capitol Hill, or because Mr Trump is being replaced by a moderate centrist Democrat in Joe Biden. As the events of January 6 showed, Mr Trump retains a huge, committed following with a significant voice in the electorate. In 2020, he increased his popular vote by almost a percentage point over 2016 (46.1 to