Who or what do the “among others” refer to in the context?

It is unclear and ambiguous, unless the reader already understands the detailed context. Other controversies, other winners, other states, or other votes?

The historical context is that the emphasis is on other controversies (rather than states, winners or votes) surrounding these events. That being so, the sentence would have been better written as “... with, among other controversies, one over ...”

To render the meaning clear while keeping the phrase "with a controversy over who won Florida's electoral votes" an essential part of the sentence (which I'm sure the writer intended to) calls for an em dash, instead of a comma.