The independent group WakeUpWalMart.com, sponsored by the United Food and Commercials Workers International Union, has released an ad attacking John McCain for supporting legislation guaranteeing equal pay for women. The ad will air in Massachusetts, Michigan, Missouri, Nevada, New Hampshire, New York, Ohio, Pennsylvania, and Washington D.C.

The ad is being released on the day of the vice presidential debate, as the battle over "Wal-Mart Moms" intensifies.

Independent ad "Breadwinners:"