Former Minnesota Viking Daunte Culpepper retired from the NFL Thursday in a statement made through email.  Culpepper said, "Farewell NFL".  He's only 31 years old and has been pursuing a job as a starter or backup quarterback this offseason.  He was offered a backup job with Green Bay and Pittsburgh but the two sides couldn't reach a financial agreement.  Culpepper began his career with the Vikings in 1999 and threw for 4,717 yards and 39 touchdowns in 2004.  He suffered a major knee injury in 2005 and was traded by the Vikings to the Miami Dolphins for a 2nd round pick in 2006.  Culpepper played for the Oakland Raiders in 2007.