Parents are "party training" kids
Essentially, they're using their children to pimp their own political agendas. Never mind when little Susie and Timmy grow brains of their own and are royally ticked off at Mom and Dad for prostituting them out as advertising; I'd be pretty angry to have pictures of me in a party line shirt given that my parents and I tend not to vote the same way.
Surely respect for your child comes before your political affliliation? Disgusting. Just plain trashy.