And if I recall correctly... yes: the Attorney General is required to defend that by virtual of her oath of office:
Section 5(b), Art. II, State Const., provides as follows: "Each state and county officer, before entering upon the duties of the office, shall give bond as required by law, and shall swear or affirm:
'I do solemnly swear (or affirm) that I will support, protect, and defend the Constitution and Government of the United States and of the State of Florida; that I am duly qualified to hold office under the Constitution of the state; and that I will well and faithfully perform the duties of (title of office) on which I am now about to enter. So help me God.',
SECTION 27. Marriage defined.Inasmuch as marriage is the legal union of only one man and one woman as husband and wife, no other legal union that is treated as marriage or the substantial equivalent thereof shall be valid or recognized.
(History.Proposed by Initiative Petition filed with the Secretary of State February 9, 2005; adopted 2008.)