A plague on both your houses, Labor and Liberal, is the evidence of today's Fairfax Ipsos poll for the two main parties. Both have suffered a slump in their primary vote.

But what about the other parties, the ones that don't fit the two-party paradigm? They are not plagued but prospering.

In fact, today's poll gives the non-major parties a record share of the vote.

The meta-trend of Australian politics for the past three decades has been the slow but sure decline of the dominance of Labor and the Coalition.