Trump has a ground game, they were discussing it here.
Trump has a ground game,Yea but he doesn't have a "bus" AKA a motorhome with vinyl graphics plastered all over it.
It may cost him on Monday night. Also, his supporters tend to be made up of a greater percentage of dems and independents. Trump has made zero effort to have them change parties before the caucus. They can change on Monday night, but there is a potential for chaos or if there is a turnout, run out of forms, etc. Anyway, just two examples.