US political analysists have expressed concern over the poor performance of President Joe Biden in the first debate with Republican challenger Donald Trump ahead of November’s razor-close election. Speaking on CNN, which hosted Thursday’s debate, several experts criticized 81-year-old Biden for unclear statements and confusing behaviour in the much-anticipated showdown. CNN political commentator Van Jones, a special adviser to former president Barack Obama, called Biden’s performance “painful.” “He’s doing the best that he can. But he had a test to meet tonight to restore confidence of the cou…