Can you spell delusional?

Listen to Tamsin Dunwoody claiming that the Labour vote held up yesterday. Apparently it was extra Conservative voters not a reduction in the Labour vote, hmmm:

Labour vote in 2005 general election - 21,240
Labour vote in 2008 by-election - 12,679

So that's 8,561 less votes in 2008 compared to 2005; how is that a Labour vote "holding up". With mathematical skills like that, Tamsin Dunwoody could be the next Labour Chancellor of the Exchequer.