No idea what the Florida Constitution says about marches or parades but here is something they might want to read...:
Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
The notion that the government cannot set aside public space for specific purposes is absurd. All you have to do to find out that what I am saying is accurate is to make yourself an Obama Sucks sign and scale the White House fence to shout your message at him.
ML/NJ