This appears to be the last statistically valid poll of Florida provided by Suffolk University (full pdf below). Donald Trump leads with 36%, followed by Rubio at 27% and Ted Cruz at 19%.
Within these polled stats you find the “Block Trump” motive for Cruz to pull out of Florida and hope his supporters shift toward Rubio. It is better for Cruz (now) if Rubio wins Florida and doesn’t allow Trump to extend his delegate lead.

Senator Cruz has never had a strong position in Florida and was reluctant to make any outlay into the state until the GOPe (Bush) donors stepped up to pay for it.
Much like John Kasich in Ohio, Senator Marco Rubio remains in the presidential primary acting solely as a tool to block Donald Trump – neither Kasich nor Rubio have any actual path to the nomination for their own candidacy.
If Senator Rubio is unable to accomplish this goal next Tuesday his usefulness diminishes rapidly.
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