I've supported Amy Klobuchar as my favorite candidate for the 2020 election. Recently she's gotten more publicity in terms of favorable mentions (fivethirtyeight's draft picked her as one of four favorites, along with Harris, O'Rourke, and Biden) and interviews on national TV.
So far the biggest negative about her is this piece in Politico, which says she has the highest rate of turnover of her staff of anyone in Congress. From this fact they deduce that she's the worst boss. While I can imagine some other possibilities I'll accept it as a factor to include in weighing her candidacy. What's a bit more important than the turnover is whether she can attract and choose capable lieutenants, both for her campaign and administration. (LBJ was a terrible boss by most standards, but he persuaded good people to work with him.)
Apparently her chief of staff was in Harvard in 2006 in a music appreciation class for which the lab page is still up. She seems to be the daughter of a Minnesota attorney and may be 32.
We'll see over the next 23 months.