Have a 1st, 2nd, or 3rd degree relationship with as many American voters as he can. That's the purpose of the rallies.
Second, because his candidacy is not politically correct, supporters are inspired by being together with so many other deplorables.
I am continually surprised at the seeming desire to go see him at large events. Hundreds of thousands of folks are being motivated to go see him in person in places around the nation.
He’s a power-house in that environment.
I was also shocked to hear the audience reaction to him on Jimmy Kimmel the other night. It sounded like everyone was an enthusiastic supporter. The reactions to his funny comments were very positive, spontaneous, and loud.