text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_16751596_16 (republican VARCHAR, lead_margin VARCHAR)
  ### Question:
  How many times did Saxby Chambliss have a lead margin of 21?
  ### Answer:
  SELECT COUNT(republican) AS :_saxby_chambliss FROM table_16751596_16 WHERE lead_margin = 21