I spotted this piece of polling in an email that was sent to me by The Spectator, which I thought readers of this blog might be interested in.
Thinking about the four Prime Ministers that came before David Cameron, who was 'a great PM'?
Margaret Thatcher 23%
Tony Blair 5%
John Major 1%
Gordon Brown 1%
Who was 'a terrible PM'?
Gordon Brown 32%
Margaret Thatcher 22%
Tony Blair 21%
John Major 8%
In other words, Margaret Thatcher is something of a Marmite figure - lots of people think she was great, but a similar number think she was terrible.
Five times as many people think Tony Blair was terrible as think he was great.
For John Major, that figure is eight times as many (but he doesn't seem to stir up strong opinions either way).
And for Gordon Brown? 32 times as many.