US presidential candidates Joe Biden and Donald Trump faced off on Thursday in the first of two debates ahead of November’s razor-close election, in a duel that saw the incumbent perform far from convincingly while Trump’s statements were peppered with lies. Both had been aiming to use the 90-minute debate to win over crucial undecided voters, but Biden’s perfomance, branded as “painful” and “dismal” after he struggled several times to give coherent answers, has sent shock waves through his Democratic Party, analysts said. Opening the post-debate discussion, CNN chief national correspondent Jo…