Barker is the only one of South Australia's remaining original six divisions that has never been held by the Australian Labor Party and is traditionally the safest seat for the Liberal Party of Australia in the state. It has been in the hands of the Liberals and its predecessors for its entire existence, except for a six-year period when Country Party MP Archie Cameron held it; however, Cameron joined the United Australia Party, direct forerunner of the Liberals, in 1940. The conservative parties have usually had a secure hold on the seat. This tradition has only been threatened three times. Labor came within 1.2 percent of winning the seat at the 1929 election, and within 1.7 percent of winning the seat at the 1943 election. In the latter election, Barker was left as the only non-Labor seat in South Australia, and indeed the only Coalition seat outside the eastern states. It would be seven decades before the conservatives' hold on Barker would be seriously threatened again.