Abstract
Federation for Australia in 1901 was closely followed by the rise of the mass party, an organisation with the potential to reduce the regional differentiation that federalism is designed to protect. Loyalty to party can submerge local issues in nationally based partisanship, and the Australian Labor Party (ALP) may have performed precisely this role, particularly if voters have not differentiated between voting for the ALP at state and Commonwealth elections. This article examines the pattern of electoral support for the ALP at state and Commonwealth elections since 1901 and finds that an apparent similarity in long-term voting support masks important variations both within and between states. The potential for mass party loyalty to create uniform voting responses across the federation has been strongly moderated by the diversity inherent in the federal system.