Rob Hyndman points out the following packages for ABS data.
readabs parses the awful spreadsheets that australian government data arrives in.
raustats does some other fancy downloading and handles Reserve Bank data too.
Peter Ellis, on his Australian Federal Election 2019 forecasts post introduces his useful ozfedelect package for R, for a bit of easy modelling. More from that author. eechidna, by Carson Sievert, Rob Hyndman, Diane Cook and Heike Hofmann and many others, has a spatiotemporal electorate data from 2001-2016, and I think ozfedelect builds upon that?