By sportsman are you really just referring to anglers? Reason I ask is because there are a number of sportsman's groups representing mostly (but not all) hunting interests in the state with some political clout. DU, TU, QU, PF, Steelheaders, ISR, etc.
If you are looking for a strictly all-encompassing angling group, good luck. Just peruse these boards and you'll find you can't even get two guys who fish for the same thing to agree, let alone two representing different species (LOL). This permit topic is one example; Many are for it, many are opposed as we've read. Where would this new group stand on the issue without upsetting the other half of it's constituency? What about crappie size limits? What about tighter controls on bass harvest numbers? What about senior fishing licenses? Then there is the personality issues and the between website fighting. Who has the persuasion and power to unite this group above and beyond all that?
I don't think any politician will have to worry about the angling crowd as a whole for quite a while. That said, start looking at individual angling groups and see who is actually doing something and start joining and working with those groups. Eventually, strength and support to several smaller groups might ultimately lead to a larger group effort given enough time.