For anyone following this, Elizabeth Warren got off without consequence for amplifying these smears because: "claims against them (congress men/women) are barred by sovereign immunity under the Federal Tort Claims Act” [1]
So - in the US, as long as you're a serving member of congress, you can unload on a private citizen with zero consequence.
[1]: https://www.huffpost.com/entry/judge-dismisses-covington-ken...