[2] He was also an elder and lay preacher at the Strathalbyn Presbyterian Church and joined the Liberal and Country League around 1940.

Senator Nancy Buttfield resigned her own seat on 8 December 1961 and won the casual vacancy previously held by Davidson, for the remainder of Pearson's term, which was due to expire in June 1965.

[2] He also served as chairman of the Education, Science and the Arts Committee and examined the need for a multicultural and multilingual broadcasting service.

Davidson served as president of the South Australian Royal Flying Doctor Service from 1965 to 1967.

[2] Davidson was appointed a Commander of the Order of the British Empire (CBE) in January 1981 for service to the Parliament.