Try county fairs, festivals, farmer's market, and other public events. Try health food stores, alternative businesses, music stores, and other potentially supportive retailers. Find out the process for voter registration. Convince others to register to vote. Join a local political group and interact.
Political action is the foundation for change.
Post brochure, fact sheets, and other literature in prominent and appropriate locations, such as the grocery store bulletin board, restaurant bulletin boards, libraries, and other local gathering places. Host a dinner party or a potluck. In the midst of good food and fun, explain your interest in the issue of medical marijuana and ask for help. Have brochures, petitions, and other materials handy. Ask for their ideas.