They've been doing this in nursing homes, state mental hospitals, and such for decades. They walk around the place, smile and introduce themselves and make nice talk to usually incoherent individuals and then proceed to fill out their absentee ballot for them. My daughter does volunteer work at a local nursing home. She's seen them doing it. They pay the desk clerk and staff off with a box of donuts or some cake.
I suggest that you post this as a vanity. Many of us are aware of the prisons, but I for one had not heard about the nursing homes.