A legal challenge may change the system used to raise more than a half a billion dollars a year to promote U.S. farm products. "Check-off" programs are managed by state and federal government and require farmers to pay a small fee each time they sell milk, hogs and other commodities. The money is used to promote sales of the products. The U.S. Supreme Court will rule this summer on whether mandatory checkoff programs violate free speech guarantees. Mark Steil of Mainstreet Radio reports.