Omar Burleson, a former U.S. representative known for his tremendous influence over conservatives from both parties during his 32 years in Congress, died Tuesday at the age of 85 in Abilene, Texas. Mr. Burleson, a Democrat, was elected in 1946 and retired in 1979. During the 1960s he headed the "Boll Weevil Club," a small group of conservative Democrats and Republicans who met informally behind closed doors to determine how votes would be cast on close bills.