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Perhaps his lack of connections :)
But don't forget that others (or was it the party itself?) got fined. A key factor in the overall outcome was that crap-ness of electoral law that made it difficult to take meaningful action. In other words, had the law been clearer/better, there could have been more prosecutions.
Watch C4 News tonight and I imagine you will get chapter and verse (as it was their investigation that started it all).
I wonder what Craig Mackinlay has done so different from all those other Tory candidates that weren't charged ? Has there been any suggest that this is something other than Battle Bus expenses ?