A series of damaging rows have severely undermined Tony Blair's standing with the public, according to the latest nationwide poll.

An ICM opinion poll for today's Guardian finds that the prime minister's personal rating is now dragging down support for Labour.

In the wake of rows over the euro, the European constitution, the reshuffle and taxes, Labour's lead over the Conservatives now stands at just four points - the lowest level since the petrol crisis two-and-a-half years ago.

Labour now stands at 38 per cent in the poll, with the Conservatives rising five points to 34 per cent.

Charles Kennedy's Liberal Democrats remain steady at 21 per cent.

The falling support for the government mirrors a growing level of public disillusionment with the prime minister.

In April 49 per cent of those surveyed said they were satisfied with his performance, compared with 42 per cent who were not.

But now his personal rating has dropped to just 29 per cent who are satisfied. More than one in two voters say they are no longer satisfied with Blair's performance.

The survey also reveals that the "not yet" decision on the euro has seriously dented support for joining the single currency.

Support for joining the euro fell by nine per cent to stand at just 21 per cent following the statement by chancellor Gordon Brown.