I retired from my job on March 31st,2007, so am just now seeing this discussion. I have literally not touched genealogy for 5 months!!
I have found Samuel in both the 1870 and 1880 census. In 1870, he was in Fractional T29, R6, Pickneyville, Clay County, Alabama, page 7 (S.C. 61, Arminda 55, Leonard 18, M.J. 16, Thomas 14, M.M. 10)
In 1880, he was in Chandler Springs, Talladega County, Alabama (Samuell C. [Dammeron] 71, Arminda 64, Thomas 24, Manervia 19). The 1890 census is missing. I have not looked into the 1900 census. Chandler Spring(s) is in Talladega County, but right across the county line from Clay County. There is a great probability that the census taker did not know where to stop and they really were still in Clay County!
My line is from David and Sarah's daughter, Martha, who married a Lumpkin. Those are the people who seemed to have vanished into thin air once they arrived in Alabama!!