How does that compare to the usual midterm early voting? Didn't D's have a huge early lead in 2016?
Not the best sauce, but no reason to doubt the accuracy. Seems real close to 4 years ago.
https://www.huffingtonpost.com/michael-p-mcdonald/early-voting-pulling-into_b_6091452.html
Republicans led mail ballots in 2010 52% to 34%, they lead in 2014 by a narrower 45% to 37%.
Rick Scott* Republican 2,861,390 48.2%
Charlie Crist Democrat 2,795,263 47.1
17-10 R-D in the House
https://www.nytimes.com/elections/2014/florida-elections