By Lord Ashcroft
Two principal questions are preoccupying Conservative commentators about the result from Oldham East & Saddleworth by-election. First, was the Liberal Democrat vote share largely due to tactical voting by previous Conservative supporters? Second, would a bigger Conservative presence on the campaign trail have made any significant difference to the result? I decided to find out over the weekend by re-polling 500 of the voters who took part in my pre-election survey (which turned out to be very accurate). The answers to the questions are: yes, and almost certainly not.