Michael Herron and Dan Smith have written this article for PSQ.  Here is the abstract:

In mid-2011, the Florida legislature reduced the state’s early voting period from fourteen days to eight and eliminated the final Sunday of early voting. We compare observed voting patterns in 2012 with those in the 2008 General Election and find that racial/ethnic minorities, registered Democrats, and those without party affiliation had significant early voting participation drops and that voters who cast ballots on the final Sunday in 2008 were disproportionately unlikely to cast a valid ballot in 2012. Florida’s decision to truncate early voting may have diminished participation rates of those already least likely to vote.