This July 2, 2013 photo shows U.S. Sen. Mike Enzi, R-Wyo., talks to constituent John Marquardt at a senior center in Pine Bluffs, Wyo. Enzi, on the left, hasn't said yet whether he will

 

              This July 2, 2013 photo shows U.S. Sen. Mike Enzi, R-Wyo., talks to constituent John Marquardt at a senior center in Pine Bluffs, Wyo. Enzi, on the left, hasn
This July 2, 2013 photo shows U.S. Sen. Mike Enzi, R-Wyo., talks to constituent John Marquardt at a senior center in Pine Bluffs, Wyo. Enzi, on the left, hasn't said yet whether he will seek re-election to the Senate while Liz Cheney, daughter of former Vice President Dick Cheney, has said she's prepared to challenge him in the 2014 Republican primary. (AP Photo/Ben Neary)