This is not a criminal prosecution. The standards of evidence and proof do not apply. There is one, and only one, criterion here: how do the senators vote? They can vote any way, for any reason, and need not explain their reasons (or can lie about their real reasons). Kavanaugh needs 50 votes (if it's 50-50, Vice President Pence will break the tie). There are no criteria, and no limits, on how or why each senator votes as she does.Why so?