the original phrase was as lovejoy says, I think. I don't know who first switched the words but it was more likely a comedian than a leftie, they're the ones who make jokes out of slogans like that
The Wikipedia link that Lovejoy quotes in answer one attributes it to Bertrand Russell.
I knew nothing about him, but the same link talks about him tearing up his Labour Party membership card at one point, which would seem to justify helpmetoo's description of lefty.