visibility whip n. a worker responsible for precisely orchestrating the presentation of placards, chants, and other demonstrations of support among delegates at a political convention, especially during speeches. (source: Double-Tongued Dictionary)
Further reading
Andres from Washington Heights, New York, heard a radio report suggesting that the same anatomy that lets humans speak also makes us vulnerable to choking, and he wanted to know more. The answer lies in the physical trade-off that sets humans apart...
In 1916, a small-town newspaper in Pennsylvania printed a fanciful item about a local gathering with a guest list that included, among others, Miss Ella Vader, Mr. Ray Zor, and other punny names. This is part of a complete episode. Transcript of...