CHARLESTON, W.Va. (AP) — A spokesman says ex-Massey Energy CEO Don Blankenship, who went to prison after a mine explosion, will run for the U.S. Senate seat in West Virginia held by Democratic U.S. Sen. Joe Manchin. Blankenship spokesman Greg Thomas says the formal filing was expected Wednesday. The Senate clerk's office says it hasn't received it yet. The 67-year-old Blankenship was released from a federal prison in California in May after serving a one-year term related to a deadly mine explosion.