Why Are Labour Voters Less Likely To Vote For Brown

On labour blogs they are spitting about the Ashdown thing, and the dumping of trades unions from policy input. Brown obviously thinks he will reaise funds elsewhere now. Many labour supporters are furious also about the Constitution stitch-up, especially as Brown’s intervention was to protect ‘free undistorted competition’.

You will be feeling shocked if you believed Gordon Brown was a ‘Labour’ leader, more to the left than Blair and more eurosceptic as he’s kind of pretended all these years. He’s turning into a stronger version of NuLab than Tony was.
It’s enough to make you stay at home

http://politicalbetting.com/index.php/archives/2007/07/29/does-this-data-make-an-early-election-less-likely/

Only 85% of Labour voters at the 2005 GE are still voting Labour.

So Brown's lift must be coming from previous non-voters.  Not a very secure base to work from!