BludgerTrack’s leadership approval and preferred prime ministership readings have been in limbo since last August’s leadership change, since it was necessary to accumulate a certain amount of data before Morrison-era trends could usefully be generated. I have now finally got around to doing something about this, the results of which can be found through the link below:
This exercise has to contend with the very substantial idiosyncrasies of the various pollsters, of which three produce data that can meaningfully be compared with each other: Newspoll, Essential and Ipsos (there are also a handful of small-sample Morgan results in the mix). This is done by calculating a trend exclusively from Newspoll, determining the other pollsters’ average deviations from that trend, and adjusting their results accordingly. For whatever reason, Newspoll appears to be a particularly tough marker, which means the other pollsters are adjusted very substantially downwards on approval and upwards on disapproval:
“PM preferred” refers to the size of the Prime Minister’s lead over the Opposition Leader in preferred prime minister polling – so Ipsos, for example, records relatively large leads for the Prime Minister in comparison with Newspoll, and is adjusted accordingly.
The job of charting trendlines through the spread of results is complicated by some notable outliers at around the time of the leadership transition. Malcolm Turnbull’s critics on the right are very keen on an Ipsos poll conducted over the last week of his prime ministership, as it is the only evidence polling has to offer that the Coalition’s present dismal position is not entirely down to the avoidable disaster of Turnbull’s removal. After a period of fairly consistent 51-49 results from all pollsters, this poll found Labor’s lead blowing out to 55-45 – and Malcolm Turnbull down nine on approval and up ten on disapproval. However, the BludgerTrack trend is not overly responsive to single poll results, so it records no sudden decline at the end of Turnbull’s tenure – only the levelling off an improving trend going back to late 2017.
Immediately after the leadership change, two pollsters posed questions on preferred prime minister, though not leadership approval. These produced very different results – a 39-33 lead for Bill Shorten from Newspoll, and a 39-29 lead for Scott Morrison from Essential. Newspoll is given a heavier weighting than Essential, so the trend follows its lead in finding Shorten with a very short-lived lead immediately after the leadership change. However, none of the fifteen poll results have replicated a lead for Shorten, so it is entirely possible that the Newspoll result was an outlier and the lead never existed in the first place.
The bigger picture is that Scott Morrison started well on net approval, but has now settled in roughly where Malcolm Turnbull was in his final months; that he is under-performing Turnbull on preferred prime minister; and that Bill Shorten’s net rating, while still not great, has been on a steady upward path since the leadership change.