Senator Amy declined to prosecute police officer Derick Chauvin for a police shooting he was involved in when she was the District Attorney.  

I think it was all in her last few days before being elected Senator.  So just handing off all biz.
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But another reason against picking Amy is that the riots might give Trump the state in November.  Then her worth as an insurance policy to keep toss-up Minnesota declines.

turn the case over to a grand jury. Still, I hope she's gone mainly because I prefer Kamala Harris.

At least she will go for it. This is more important to me because I am afraid, in the name of uniting the country, Joe will not do the right thing in terms of punishing the crimes of Trump and his criminal enterprise!

Warren would be a terrible pick for 1 big reason.  Her states Govenor is a Repub.  So, he gets to put a republican in her senate seat.  That would not be good if u are trying to take over the Senate.