The fact that unions have to look towards Wal-Mart for new prospective members shows how sad of a state organized labor for the private sector is in the USA.
In the private sector, unions theoretically derive their power only from the fact that the cost of replacing skilled labor is theoretically prohibitive to most employers. For places like Wal-Mart, most, if not all, of the workers are unskilled labor, and thus very easy to replace.
Of course, I state this in theory only because in the private sector, most companies have been able to reduce the replacement costs of skilled workers to the point where there is no benefit to unionizing.
Recently a new W-M store was to open somewhere needed a few hundred employees!!!
Thousands (10,000?) lined up with their applications???