Rubio would be a mistake:
[L]arge majorities of Hispanic voters in Southwestern swing states prefer Democratic policy priorities, and this is one reason why they tend to vote overwhelmingly for Democratic candidates at the federal level. In 2008, 69% of Latinos in New Mexico voted for Obama, as did 61% of Latinos in Colorado. There’s no real reason to expect that having Rubio as a running mate is going to close that gap significantly. Making Rubio the VP nominee would be another blunder of promoting an unqualified rising politician too quickly for his own good in the name of generating enthusiasm for the presidential ticket.
But Florida? Or is that out of contention already?