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Mayor Morrison supports same-sex marriage and is a member of Mayors for the Freedom to Marry.
The possessive form for the proper noun Gus is Gus's.
Example: We're invited to Gus's backyard barbecue.
The plural form of Gus is Gus's.
Gus Hansen goes by Gattling Gus, The Poker Tramp, Gamblin' Gus, Mad Gus, and The Great Dane.
Gus Lewis goes by Gus.