Deductive reasoning.
Why else would Amy Klobuchar make a public statement withdrawing herself from contention?
None of the other prospects did that.
Why did she do it?
Well, because she already had confirmation from Joe Biden that it would be her.
Once it came out that she could've prosecuted George Floyd's killer years ago but chose not to, she realized that her being his running mate would be a hindrance.
Plus, she probably didn't want to subject herself and her family to the scrutiny of that situation.
Only thing that makes sense.