According to the information on the James A Garfield Campaign page, there are more than 4,000 registered contributors working on this campaign. I recently came across a PBS documentary about JAG, available at the youtube link below. Note that this documentary was originally made 10 years ago, however anyone who hasn’t seen it (myself included!) may enjoy it.
https://www.youtube.com/results?search_query=james+garfield+pbs+documentary