That’s probably why Rubio is hitting Trump hard in GA right now (or at least a few minutes ago).
From RCP as of Thurs:
Georgia Republican Presidential Primary TEGNA/SurveyUSA Trump 45, Rubio 19, Cruz 16, Carson 8, Kasich 6 Trump +26
Georgia has a 20% threshold to get any statewide delegates!
This explains why Rubio is campaigning in a state he has NO CHANCE of winning!