Scott Johnson at Power Line has info he trusts that Joe Biden will announce this weekend that (a) he is dropping out of the race for the nomination, (b) he supports Kamala Harris to replace him, and (c) his delegates are free to choose whomever they wish. Scott's informant claims Joe's speech announcing this is being written now.
As Scott's colleague John Hinderaker comments, Biden dropping out and Harris taking over won't necessarily help Trump. Harris can blame the failures of the past three plus years on old Joe and his minders, while taking credit for any pluses they can claim responsibility for.
There are probably few who will switch their votes just because Harris is what we once knew was a woman. Those who feel strongly about that issue are already Biden voters. She may get more BIPOC votes than Biden would have, but again that isn't certain.
Later ... Instapundit runs a repudiation of the Johnson-reported leak. Be cautious about all the supposed "inside scoop" being peddled. That's the second one I've had to issue a caution on.