The US presidential race at the weekend gravitated to Florida, and the arrival of former president Barack Obama on the campaign trail provided Democratic candidate Joe Biden with welcome ballast just as President Trump hit more disciplined messaging at the final debate in Nashville on Thursday (Friday AEDT).

Obama fronted a drive-in rally in Miami on Saturday (Sunday AEDT) and will headline another this week in Orlando. Florida and its 29 electoral votes went to Trump in 2016 by a 1.2 per cent margin, or just 113,000 votes. RealClearPolitics’ average of polls in the state has Biden leading the President 48.6 to 47.1 – a statistical dead heat.