I found John's first marriage at www.genealogytrails.com/Ken/washington/1802marriages.html
but there's no additional info.
There is a book "Record of Marriages in Washington County Kentucky for the Period of years 1792 to 1825". You can contact your local public library and ask for the book via inter-library loan. If the holding library won't send it to your library, your library can ask them to zerox the pages where their names appear.
You can contact the Washington County Clerk, www.washingtoncountyky.com/clerk.html
about ordering copies of the documents. Successful Searching!