Because of the large number of electoral votes, and the fact that the margin was less than 1% in 2012, Florida will be one of the more important battles in the 2016 presidential elections.
A poll released on 7/23 shows Hillary Clinton beating the top 4 Republican candidates with the closest being Rand Paul.
Clinton 46% Rand Paul 42%
Clinton 47% Jeb Bush 41%
Clinton 49% Chris Christie 38%
Clinton 53% Marco Rubio 39%
The Republicans on the other hand win all the races in the hypothetical head to head against Joe Biden:
Biden 38% Jeb Bush 47%
Biden 39% Chris Christie 48%
Biden 39% Rand Paul 47%
Biden 43% Rubio 46%
Barack Obama beat Mitt Romney 50.0% to 49.1% in Florida in 2012.
More details
here including a poll on the Florida Governor race.
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