Davidson was inspired to join the Co-operative Commonwealth Federation (CCF) in the 1930s after meeting J.S. Woodsworth. She ran twice as a candidate for the party losing both times. She left the party after the CCF merged with the Canadian Labour Congress to form the New Democratic Party of Canada. In 1971 she ran for the Liberals in the 1971 provincial election but lost to incumbent Arthur Meen. In the last six years of her life she concentrated on writing a twice weekly column for the "Toronto Sun" and also focused her efforts on environmental conservation. She died in 1978 at the age of 77.