 Biden has said he's not getting out of the race, but ABC's Rachel Scott says some Democrats believe they've identified the fundamental problem for the 81-year-old. One Democratic lawmaker telling me that the common denominator between all of these concerns is something that the president cannot change, no matter how many interviews that he does, no matter if he does another debate, no matter how many campaign rallies. And that is because they say this has to do with what happens