A few times ago, one discovered that more than 80 U.S. mayors had decided to support gay marriage by forming a coalition with the group Freedom to Marry. They are not 80 anymore but 116 mayors.
This coalition requires in particular of President Obama to pass a federal marriage equality:
"We stand for the freedom to marry because it enhances the economic competitiveness of our communities, improves the lives of families that call our cities home, and is simply the right thing to do," reads a statement from the mayors’ group.
Among the new mayors who joined the coalition, there are:
You can see the complete listing of the mayors being part of the coalition on the site Freedom To Marry.