Labour leader David Shearer has dropped in popularity according to a poll, but political commentators say it's not his fault.
Shearer polled at 13 per cent as preferred Prime Minister last month, dropping from 14 per cent in May, a One News Colmar Brunton poll has revealed.
In April his popularity stood at 11 per cent.
Speaking on Q+A today, former Labour minister and Waipareira Trust chief executive John Tamihere said the figure could be attributed to several factors.
"Shearer's problem is that he also has a front bench that's not firing. He can't do everything.