If there was ever a secret to actor-politician Fred Thompson’s presidential campaign, all the wrapping came off Tuesday when West Virginia Republican party officials announced the former Tennessee senator has filed to participate in the Mountain State’s primary convention. Thompson, 65, who served two terms in the U.S. Senate, plans to make the little-kept secret public Thursday when he will make the official announcement he is a candidate for president. He appears on The Tonight Show tonight with Jay Leno. But Bob Fish, chairman of West Virginia’s GOP convention, said Thompson met the party’s Sept. 1 filing deadline. Fish announced...