I recommend some type of cookie-cutter response that we can just copy-and-paste depending on the mistake made. For example:
"This type of question is considered a 'poll' and is outside Stack Overflow's scope. Please rephrase the question so that it can be answered definitively or it will be closed."
This type of question is considered a 'poll' and is outside Stack Overflow's scope. Please rephrase the question so that it can be answered definitively or it will be closed.
...or something like that. I think that the moderators on javaranch.com do something similar when their newbies break the rules.