2. There is a clear judicially discoverable and manageable standard for resolving it.
There is no judicial review of any impeachment proceeding. There is no judicial role whatsoever. See my #227.
So you believe that the party controlling Congress can accuse, try and convict any private citizen for Constitutionally protected speech and bar them from ever holding public office, regardless of whether or not they are then holding or have ever held public office, and there is no right to any judicial review as long as Congress calls it an impeachment.
Okie-dokie.