The triad itself is held together by the campaign organization, or a coalition of several. The structure of such organizations can be as loose as ad hoc steering committees, or as formal as corporations. If substantial moneys will be received and spent, and in most campaigns they will, then some corporate protection is desirable. Non-profit corporations are most often used for this purpose. They require a board of directors and a voting membership.
Several formats exist for nonprofits, but political activity narrows the options.
Additionally, most states have filing requirements for lobbyists and the organizations that hire them. Not all lobbyist are hired guns who would just as soon lobby against you as for you. There are quite a few professional lobbyists out there who actually come to medical freedom out of a personal regard for it. A few have been known to have begun in the grass roots and, by increasing involvement, eventually found themselves with a new profession. But, even mercenaries can be used successfully if activist types stay in charge of the substantive issues.