Seagram Corp.'s use of TV ads for Crown Royal scotch whisky is already attracting Capitol Hill attention. Rep. Joe Kennedy II, D-Mass., on Thursday will introduce legislation seeking to ban broad ads for spirits. Mr. Kennedy had earlier introduced legislation aimed at limiting beer and wine ads at night, but the latest proposal goes farther. The U.S. Supreme Court in the recent 44 Liquormart case took a harsh view of advertising bans, but in that case ruled specifically on bans that apply to print advertising. Traditionally, broadcasters, which must obtain licenses from the government, have been open to greater regulation.