Ending it wouldn't even be slightly controversial in the one state where support for the embargo traditionally has been by far the strongest and most politically sensitive.
That's not how this works.
The people who want to end the embargo are the vast majority of Floridians, yes. But these aren't people who'll vote on ending the embargo. The ones who would have their vote decided by who supports the embargo (mostly older Cubans) skew heavily pro-embargo. The majority may support it, but they're not voting on it.