They are already banned if they promote a political party.
However you are allowed to promote a view point which seems strange.
There are double standards as Moderators can promote a political action eg please contact your senator (
http://www.linuxquestions.org/questi...ghlight=alaska which I agreed with by the way)
but ordinary users can only promote something if no Moderators disagree are anti it.
However I think political threads are good providing Moderators do not give themselves the last word !