 As anxious congressional Democrats returned to Washington, weighing whether to work to revive his campaign or try to edge him out, Biden sent them an open letter aiming to silence their skepticism of his fitness to lead the country for another four years. He insisted he wasn't leaving the race and stressed that the party has one job, which is to defeat presumptive Republican presidential nominee Donald Trump in November. Democratic Representative Alexandria Ocasio-Cortez threw her support behind Biden after meeting with him.