 A member of Mayors for the Freedom to Marry, he and the Mayor Stephanie Rawlings-Blake of Baltimore and Mayor Julián Castro of San Antonio published a column, Gay marriage a question of justice, in USA Today in January 2013.In 2019, Cabaldon was named chair of the LGBTQ Mayors Alliance.He is a member of the Mayors Against Illegal Guns Coalition, and a signer of the US Mayors Climate Protection Agreement.