NEW YORK (AP) — President Joe Biden is looking to recapture his mojo and reassure donors at a Saturday fundraiser that he is fully up to the challenge of beating Donald Trump. The 81-year-old's troubling performance at the first presidential debate Thursday rattled many Democrats, who see Trump after the Jan. 6, 2021, insurrection as an existential threat to U.S. democracy. Biden's meandering answers and struggles to respond...