The statement was that it was a predominantly, if not all, white turnout with great enthusiasm to stand in line for several hours. The non-white population is heavily Democrat, which is the reason Dems have higher registration there.
Not scientific, but that’s an indication that these are Trump supporters. I don’t believe Hillary supporters are that excited about her.
Weird thing is that 50 years ago, Broward county was the most Republican county in Florida. It went for Goldwater in the ‘64 election.