A poll by Help the Aged shows that 15 per cent of people with a 'preferred party'would switch their vote during the general election to a party which promised free personal care for elderly people.The charity also found that 54 per cent of floating voters would be swayed by the issue.Sir Stewart Sutherland, chair of the Royal Commission on LongTerm Care, said: 'This poll sends a clear message to all parties and particularly candidates contesting marginal seats that the issue of long-term care... cannot be ignored.'