 they still believe the president is the only candidate who can beat Trump, according to two people familiar. The first lady has also expressed fear that bowing out would make the Atlanta debate a defining image of her husband's presidency, an outcome she finds unacceptable, the people said. Biden's sister Valerie also remains committed to the campaign, but has not ruled out advocating changes if the race becomes damaging to her brother's health and legacy. So, in essence,