Is that right? I will vote twice, now, and see what happens.
I was going to test it before your reply, but I didn't want to risk my integrity.
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I learned a long time ago that if you want to know if a computer will do something, all you have to do is try it and see. If it allows multiple votes from the same voter, it's a meaningless survey anyway, and there's no harm done. But the fact is that it will not allow you to vote more than once.