If anything wins the day for Murphy, it'll be Clinton's ground game (and Trump's lack of one), but I think the Clinton campaign really doesn't care about getting Clinton/Rubio voters to the polls.
I was watching one of the MSNBC shows this past week and that seems to be the viewpoint from the national party. Basically. FL-Sen will fall if Hillary wins by enough and Rubio wins if it's closer. In other words, there's not much that can be done in terms of the air game. A lot is really dependent on the ground game. If Hillary can win Florida by about 5%, her superior ground game could be enough to take him out, but there really is no margin for error. Things need to go very right for Murphy to to win.