Libertarian Lucas Overby is cutting strongly into Jolly's support among Republicans:
46% Sink (D)
37% Jolly (R)
12% Overby (L)
...
Methodology:
The Saint Leo University Polling Institute poll of likely voters who live in FL-13 was conducted February 9-11, 2014 using a blended sample reached by Interactive Voice Response and an online panel. The sample size was 400 respondents, yielding a margin of error of +/- 5% with a 95% confidence level. 372 respondents (93% of sample) were reached on randomly dialed landline telephones using an automatic dialer, pre-recorded questions, and touch-tone telephone keypad responses. To ensure that a representative sample of younger voters was included, 28 respondents in this age group were reached using an online panel. Given that this is a special election, this survey was conducted among likely voters only. To be included in the survey as a “likely voter,” all respondents had to affirm twice that they are 18 or older.
http://polls.saintleo.edu/new-poll-sink-leads-jolly-46-37-in-fl-13-special-election