The survey was undertaken to provide insights that would help unions organize these workers.
Sports is a fair answer.
They'd rather go to a ball game than attend a union rally, no matter how worthy the issue. They spend a lot of money on the apparel of their favorite teams. They read the sports pages daily and talk about last night's games. There's very little going on in the union that interests them except around contract time. And they get no special attention from union officers, nor are they given assignments that interest them.