Bradford West by-election 2012

A lot of crowing from the Conservative Party about Labour losing their 'safe' seat to George Galloway with a massive 55% drop in votes from the previous election. (18,401 to 8,201)

Keeping oddly quiet though about their own 78% drop (12,638 to 2,746) or the LibDems 68% drop (4,732 to 1,505)

I wonder why?