So what is supposed to be so great about Rubio that people have voted for him as a Senator?
Marco pulled the wool over many voters' eyes when he first ran for Senate. He talked like a Tea Party conservative, then once in office (during the rare instances when he was sufficiently motivated to even show up), he voted like a McCain-Graham liberal.
After that, the power of incumbency explains his re-election. It seems damned difficult to remove a dud once he gets into office, McCain and Graham being cases in point. Marco's role in the Gang of 8 and his arrogance didn't sink him, though they probably did cost him the FL vote in the Presidential primaries.