President Joe Biden sent a defiant letter to congressional Democrats on Monday morning stating unequivocally: “I am firmly committed to staying in this race.” This followed his Friday interview with ABC’s George Stephanopoulos, in which he said it would take a literal act of God to force him off the 2024 Democratic presidential ticket. “If the Lord Almighty came down and said, ‘Joe, get out of the race,’ I’d get out of the race,” said Biden. “The Lord Almighty’s not coming down.” That interview failed to reassure many Democrats that Biden has the stamina to defeat Donald Trump in November, or …