An influential US senator on Sunday joined calls for President Joe Biden to end his candidacy in favor of a younger Democrat, while a shock poll from the swing state of Michigan illustrated the growing sense that he will lose to Donald Trump if he stays in the race.
"I came to this decision with a heavy heart, but I think it's time to pass the torch to a new generation," Senator Joe Manchin, a Democrat-leaning independent from West Virginia, said on CNN.
