Do you support voluntary student union membership?
Of course they could all publicly indicate what they DO think.
Of course any don't say they will fully support free choice of students to belong or not belong to a student union, don't deserve the vote of freedom loving people. In fact if they prevaricate, just say "fuck off you fascist, I may as well vote Labour".
Of course if they all support it like David Farrar does, then there MIGHT be one step forward for freedom if the Nats win.