I don't know what the fallout from 'bigotgate' will be, but I wouldn't be at all surprised if it resulted in a rise in support from the BNP. And I don't say that lightly. But look at it this way. Brown has not only insulted Mrs Duffy, he has effectively branded everyone in this country who is concerned about immigration a bigot too. Brown and Labour already have a problem with the white working class vote in areas like Dagenham, Barking, Burnley and West Yorkshire. It is those areas where the BNP is already reaping electoral benefit.
They will now make hay out of this gaffe in their GOTV leaflets.
And I wonder how Clegg and Cameron will play it in the leaders' debate tomorrow. I imagine Brown will try to crack some sort of joke of it, but Cameron needs to think of a good rejoinder.
I don't necessarily subscribe to the view that this incident will be the gamechanger Paul Waugh and Ben Brogan are suggesting. But it could be. Labour needs to do something to change the media agenda within the next few hours. Something big.