Based on the clue '51 men have held this post that tells members of t...', what is the answer?

Based on the clue '50s pop duo phil don who also collected classic f...', what is the answer? What is referred to by '50s senator cary kefauver'? What is associated with: 50s sitcom dad to ricky david who became president of south africa in 1994? What is associated with: 50s tv puppet thats the subject of a 1999 custody battle between the dia its owners heirs? Based on the clue '511 is another way to say it tmi', what is the answer? Based on the clue '512 feet below sea level lake assal', what is the answer? Which performer is associated with '5150'? Based on the clue '52 billion 6 bil richer this year despite handing ...', what is the answer?