An earlier blog post mentioned a minister who married William Rhodes/Rhodus and Lucretia Jones in Macon County, Missouri in 1860. A little googling and I might have found him.
Unfortunately, the link for "OBITUARY" comes from the New York Times and the first paragraph was unavailable. Fortunately the snippet from Google's search results provided me with at least a potential name for this man. There's a good chance it is the one I want as the marriage license is signed by O. R. Bouton--not the most common name. Back to searching.