LAS VEGAS -(Dow Jones)- Federal Communications Commission Chairman Kevin Martin on Tuesday suggested that he wants to force cable companies to carry multiple digital programs from broadcasters, stirring up an issue that is a long-standing source of tension. "One of the reasons why I think it was a real missed opportunity for the commission to have not addressed multicast carriage in such a way that it would have allowed broadcasters to produce multicast broadcasting in a digital era and having all of those signals carried by the cable companies is that would have provided for an increase in the...