Since resigning as leader last month, he has been gauging support among the membership through a postal ballot.
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He said he had received around 2000 responses from members, and around 75 per cent had been supportive.
The Conservatives have slumped in the polls since Mr Craig's resignation and the party's subsequent collapse. In the latest TV3 poll, the party picked up just 0.7 per cent of votes - down from 4.1 per cent on election day.