Really makes no sense when Rubio could just cut a deal with Scott this year to support in the legislature and eventually sign a bill lifting the prohibition on a simultaneous run in return for Rubio's support and money this year in Scott's re-election campaign. I would presume he still runs for re-election because his 2013 immigration move already destroys his chances of winning the primary and if he looked at the polls, he should know the obvious choice given the frontrunner for his Senate seat is a 0-2 Democrat who already lost statewide.
In the case that he doesn't run again or he just loses re-election, I would bet either on a 2018 run (if Nelson retires) or a 2022 Senate run against whichever Democrat he lost to in the first place because I doubt he would run against Crist assuming he runs again and beats Scott this year and with other FL Republicans already interested in the Governorship, I think his mind will stay on the Senate.
I think Rubio is already essentially expected to push Scott's re-election. There are varying degrees of support, of course, but it'll look bad to his home-state base if he mostly sits on his hands and Crist wins. There's also only so much $ support he can provide as he'll need every penny as seed money to jump start his faltering campaign.
Besides, if Rubio is out of his senate seat that's one more potential job Scott could later target regardless of his re-election race's outcome.
