 Before Thursday's debate had finished, some Democrats and Biden allies were calling on the president to withdraw from the White House contest. But influential voices within the party aren't giving up on their presumptive nominee just yet. On social media, former President Barack Obama alluded to his own poor showing in his first 2012 debate, saying bad debate nights happen. And House Democratic Leader Hakeem Jeffries answered with a flat no when asked if Joe Biden should step aside. Greg Clugston, Washington.