All before he has officially announced:

da Rozett, a longtime U.S. Chamber of Commerce official, is gone from the former Tennessee senator’s committee to “test the waters” of a presidential bid after spending the last several weeks as communications director.

“I don’t know what the story is,” said Thompson, who was asked about the departure while campaigning at the Minnesota state fair. “I don’t know what to say about it except that she’s a wonderful lady.”

From the Associated Press

See also Thompson Taps Third Campaign Manager, & NY Times Reports on Thompson Campaign, & Another One Bites the Dust in Thompson’s Crew.