Michael Tomasky: Interesting wrinkle from the old home state

Joe Manchin, the governor of the old home state, announced today to no one's surprise that he's running this fall for Robert Byrd's seat. Republicans wanted to put up Shelly Moore Capito against him. She's a member of the House and the state's highest-profile Republican, the only one who could give Joe a race.

But as an incumbent House member, she has to choose between seeking reelection and trying to go for the Senate. Right? Usually. But not in this case. What gives?

Because Byrd died, the...