Washington: It was his last stop of the day on a West Coast swing, a backyard fundraiser at a TV producer’s home in Los Angeles, and President Joe Biden was telling the crowd how tough the past few years have been. He ticked off challenges: Technology that’s made it easier to corrupt the truth. Russia and China’s efforts to upset the world order, surging inflation at home. The lingering pandemic. The after-effects of the Capitol riot. Election deniers and their impact on the upcoming nationwide voting. Still, for all of that, Biden insisted, the nation’s best days lie ahead. The…