If Kammie was at least partly 25th Amendment insurance - she also is a woman and identifies as black (1/64th? 1/128th? 1/256th?) - she has become a quagmire. If Joe is untenable, then who?
Kammie? Unpopular, but if rejected Race Cards will fly.
RFK Jr.? I don't think his brand of fruitcakery will sell.
Marianne Williamson? More fruitcakery.
Goobernor Noisome? I don't think he plays well outside of California Dem circles.
Mooch-chelle? I'm not sure she can hide her hatred for white people, and her hand full of Race Cards may play poorly.
Of course, my views plus a tenner will get you a 600-calorie coffee drink and change at Dutch Bros.