Carson is also the son of former Kansas State standout and NFL tight end Paul Coffman.

Coffman assumed the role of starting quarterback after Josh Freeman left one year early for the NFL Draft.

For the second year in a row, he had a tremendous Spring Game, and was voted as a team captain and player representative for the second consecutive season.

Coffman will be remembered for his effort in the 2011 Sunflower Showdown where he had a quarterback rating of 231.6, leading the Wildcats to a 59–7 victory against the Kansas Jayhawks.

For the 2013 season, Coffman signed with the Kansas City Renegades of the Champions Professional Indoor Football League.