This question already has an answer here:
There is a candidate in the Server Fault election (which is ending shortly) that has been suspended from the main site for behavioral reasons more than once. He's also been kicked from chat, and banned on at least three other SE sites. He even had his original nomination deleted by Shog9, because of the profanity it contained. His nomination was reinstated after he cleaned it up.
Now, let's be real, there's no chance he's going to win. But it raises an good point. Why is someone that's been such a behavioral problem even allowed to run in the first place? Shouldn't someone with a history like that be prevented from running for the most powerful position in a community?
At the very least, shouldn't his election profile show the number of times that his user account has been banned on any SE site very clearly and prominently?