Because she's a woman, relatively moderate, from a Midwestern swing state?

I went to her speeches and voted for her when I lived in Minnesota but I know liberals who can't stand her because they think she's abusive to her workers.

Not sure how Facebook works - can't moderators ban people and hide / delete posts?

delete posts and block posters.

Amy Klobuchar has opted not to do that. She leaves the ugly posts there for people to see. Good decision on her part, I think.

I imagine it's more likely that it's a volunteer.

Making the page unpleasant to visit doesn't seem like a good idea to me.

she has explained how it is to be moderated to those who do moderate it.

From what I know of her, she would not remove such materials from her public page. She leaves them there, to illustrate how wrong the other side is.

I admire her forthrightness.