There were more than 300 people there. I know because I counted seats. (And all the standing people AND the people literally standing outside the door.
NewsJacksonville.com has a great article about the event. Here are some excerpts and you can read the entire story by clicking on the link.
A cheering crowd. A massive, nearly identical lead in two polls over as many days. Marco Rubio walked into a Beaches community hall Wednesday seeming anything but the underdog he was just months ago...
To the crowd of about 300 packed wall-to-wall, Rubio said he couldn’t concentrate on popularity statistics. He had to stop, to sometimes-standing applause, as he reaffirmed his position against government-run health care, accused Washington of dismantling the free market system and said Americans are within plain sight of losing everything that makes the nation great.
The NewsJacksonville.com link also has a link to a dozen or more photos which are better than mine. Time to get a real camera for me. :)