There is institution that specializes in running political campaigns. I'm not sure what they do exactly because half their webpage fails to load, but I think it's something like that.
Anyway, as an exercise (or joke?) their members are running mayor campaigns for fictional characters.
New Organizing Institute.
And here are the candidate pages:
Only Spidey is running for the Marvel party, but they are a bunch of communists so don't vote for him.