Check out the Vigo County Public Library Website and you will find the answer to your query.I found Rev. D. C. Carnahan (obit in tribune newspaper on 9 July 1935) listed in their Wabash Valley Obit Index.You can order a copy of the obit from the library. http://vax1.vigo.lib.in.us/http://vax1.vigo.lib.in.us/Go to the website. Then click on Wabash Valley Obituary Index, then 1921 - 1966......click on C for Carnahan.
Also I'm the Genealogist for the Sullivan County Public Library Genealogy Dept.I would have a copy of the marriage application for 1912.If you would like a copy just contact me at firstname.lastname@example.org and I will be happy to help.Good Luck!
Sincerely, Donna K. Adams Sullivan County Public Library Genealogy/Local History Dept. 100 S. Crowder St. Sullivan, IN47882