Mike Smithson asks us today whether the clear out of the Tory miscreants represents David Cameron's Clause 4 moment.

Fair enough, you might say, but... a quick delve through Smithson's archives tell us that...

Even before Cameron was elected, in May 2005, Smithson was suggesting that if the Tories chose Ken Clarke... it could be their Clause 4 moment.

Then, a few months in to Cameron's leadership, Smithson suggested that the NHS was Cameron's Clause 4 issue.

Not long after that, Smithson suggested that David Cameron was making the issue of female MPs... wait for it... his Clause 4 moment.

Less than a month lapsed before Smithson asked whether Cameron's little remembered policy programme "Built to Last" was his (yawn) Clause 4 moment.

We then had a brief respite, with Smithson asking whether Gordon Brown was considering allowing the rats who joined a sinking ship to rejoin the Labour Party, and if so, was this Gordon's Clause 4 moment.

Then, earlier this year, the wheel had nearly turned a full circle when Smithson suggested that bringing Ken Clarke back in to the Tory front bench would be Cameron's Clause 4 moment.

Do you think, by any chance, Mike Smithson has been deeply affected by Blair's Clause 4 moment? Just wondering.