Holy wow. Nothing but a few tweets so far, but just... wow. Aaron Blake:
FL state Senate President Mike Haridopolos has withdrawn from #FLSEN, saying he can't run and hold current job at same time. Wow.
Wow Mike Haridopolos dropping out of Fla. Senate race: "The responsibilities I was managing on both fronts are in conflict."
Haridoplos: "Instead, I am re-dedicating myself to finishing the job you sent me to do here in Florida."
More as we learn it.
UPDATE: He has a video on his website (which is where these quotes are taken from):