(1) Notwithstanding any other provision of this part, any county or municipality issuing revenue bonds hereunder for any of the purposes provided in this part, shall have power to pledge the full faith and credit and ad valorem taxing power of such county or municipality for the payment of the principal of or interest on such revenue bonds if the issuance of such revenue bonds with such additional pledge shall have approval by the qualified electors who are freeholders residing in such county or municipality in an election called, conducted and held in the manner provided in the constitution and statutes of Florida for the holding of freeholder elections.