Sen. John Barrasso is about to announce his bid for re-election.
The junior Republican senator from Wyoming has scheduled the announcement for noon Tuesday at the State Capitol in Cheyenne.
Gov. Dave Freudenthal appointed Barrasso to office in 2007 following the death of Sen. Craig Thomas. Barrasso won election in 2008 to serve out the remainder of Thomas' term.
So far, Barrasso is being challenged by another Republican, Thomas Bleming, of Lusk.