This week’s Essential Research shows no real change in voting intention on last week, with the Coalition up a point on the primary vote to 49 per cent, Labor and the Greens steady on 31 per cent and 11 per cent, and two-party preferred steady at 56-44. The poll also measures Bob Brown’s approval rating at 42 per cent and disapproval at 34 per cent (including very favourable figures among Labor voters of 60 per cent and 15 per cent); has 31 per cent favouring Kevin Rudd as Labor leader over 16 per cent for Julia Gillard (Gillard leads 40 per cent to 33 per cent among Labor voters); and 30 per cent favouring Malcolm Turnbull as Liberal leader with 23 per cent for Tony Abbott (Abbott leads 39 per cent to 26 per cent among Coalition voters). Further questions on the mining boom have 66 per cent believing it has benefited them “not at all”, 51 per cent supporting the mining tax (down one on mid-March) and 29 per cent opposing it (down five).

Federal preselection happenings in New South Wales:

• The NSW Liberal Party state executive has voted to dump Garry Whitaker as its candidate for Craig Thomson’s seat of Dobell. He has been replaced by Karen McNamara, a WorkCover public servant who reportedly has backing from the party’s right, who was defeated by Whitaker in the original preselection vote in December. Whitaker has since been struggling with allegations he had lived for several years without council permission in an “ensuite shed” on his Wyong Creek property while awaiting approval to build a house there.

• More proactivity from the NSW Liberal state executive in neighbouring Robertson, a seat the party was disappointed not to have won in 2010. Local branches have had imposed upon them Lucy Wicks, who herself holds a position on the executive by virtue of her status as president of the party’s Women’s Council. Wicks was identified by the Sydney Morning Herald last year as a member of the “centre right” faction associated with federal Mitchell MP Alex Hawke, which in alliance with the moderates had secured control of the state executive. Like the Dobell intervention, the imposition of Wicks occurred at the insistence of Tony Abbott – local branches in both seats have called emergency meetings to express their displeasure.

• Michelle Hoctor of the Illawarra Mercury reports Ann Sudmalis, the candidate backed by retiring member Joanna Gash, won Liberal preselection on Saturday in Gilmore with 16 votes against 10 for her main rival Andrew Guile. Rounding out the field were Alby Schultz’s son Grant, who scored four votes, and Meroo Meadow marketing consultant Catherine Shields on one. For those wondering about the small number of votes, the NSW Liberals’ preselection procedure involves branches being allocated a number of selection committee delegates in proportion to their membership, rather than a massed rank-and-file ballot.

• Imre Salusinszky of The Australian reports the Nationals are in the “‘initial stages’ of discussions with popular independent state MP Richard Torbay about endorsing him for a tilt at independent federal MP Tony Windsor in New England”. Torbay has been the independent member for Northern Tablelands since 1999, and served as Legislative Assembly Speaker during Labor’s last term in office.