From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. a person who takes a conspicuous public position in proposing a new idea or initiating a new policy, who may become a target of criticism for those opposed. "The Secretary of State served as point man for the administration's new China policy." [PJC]
From WordNet (r) 3.0 (2006) [wn]:
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