Democratic President Joe Biden delivered a shaky, halting performance at Thursday’s debate while his Republican rival Donald Trump battered him with a series of often false attacks, as the two oldest presidential candidates ever exchanged deeply personal insults ahead of November’s U.S. election. The two men traded barbs on abortion, immigration, the wars in Ukraine and Gaza, their handling of the economy and even their golf games as they each sought to shake up what opinion polls show has been a virtually tied race for months.