Here's South Carolina's:
BUT, it's indirectly for bicycle advocacy. In SC, a nonprofit can apply for a special tag for its members. The Palmetto Cycling Coalition is the leading advocacy organization in the state, and applied for this tag. The requist 1000 pentioners were fairly easy to come by, but you still need to be a member of the non-profit to get the tag. A portion of the extra fee goes to the non-profit.