Federal investigators have requested documents from the office of West Virginia Gov. Joe Manchin (D), according to the AP.

Manchin spokesman Melvin Smith would not comment Friday on which officials were contacted, or what was requested.

But Smith did say that investigators haven't said that the governor or any other state employee is under investigation.

Federal prosecutors declined comment Friday. So did Larry Puccio, Manchin's former longtime chief of staff who now chairs the state Democratic Party.

Manchin has announced his intention to run for Senate in 2010 and is considered the heavy favorite to hold late-Sen. Robert Byrd's (D-W.Va.) seat for Democrats. If it becomes clear that the investigation focuses on Manchin or his office, it could dramatically shake up the dynamics of the race.