One in five voters say they are more likely to vote for the Conservatives because Michael Howard is leader, according to a new poll.
Michael Howard became Tory leader last November
The group was split between those "a lot" more likely to back the Tories and those "a little" more likely.
But some 10% of 1,010 people surveyed for BBC1's The Politics Show said his replacing of Iain Duncan Smith had made them less likely to vote Tory.
ICM Research found some 68% said the change did not effect their intentions.
Iain Duncan Smith resigned in October 2003 after losing a confidence vote.
Mr Howard was voted in as Conservative leader the next month.