Throughout their history, the Liberals have been in electoral terms largely the party of the middle class (whom Menzies, in the era of the party's formation called "The forgotten people"), though such class-based voting patterns are no longer as clear as they once were. In the 1970s a left-wing middle class emerged that no longer voted Liberal.[citation needed] One effect of this was the success of a breakaway party, the Australian Democrats, founded in 1977 by former Liberal minister Don Chipp and members of minor liberal parties; other members of the left-leaning section of the middle-class became Labor supporters.[citation needed] On the other hand, the Liberals have done increasingly well in recent years among socially conservative working-class voters.[citation needed]However the Liberal Party's key support base remains the upper-middle classes; 16 of the 20 richest federal electorates are held by the Liberals, most of which are safe seats. In country areas they either compete with or have a truce with the Nationals, depending on various factors.
When did a left wing federal electorate emerge that no longer voted liberal?