My initial post answered it, I thought, by naming the source of the comment, his position, and his view.
I said: "Interesting and telling comment in this video interview from the FT with their Chief Political Commentator."
http://video.ft.com/4943008783001/Camerons-terrible-mistake-on-Brexit/latest
I don't subscribe to the theory that opinions are all of equal weight, regardless of the background of the people putting them forward. There are experts in all walks of life and all business areas who get called upon to demonstrate their expertise in the course of their job.
But on the specific subject of the referendum, it's those experts whose expertise lies in politics, economics, constitutional and international law, trade, and finance, who have the "relevant" expertise to have more weight attributed to their commentary.
People can be master bakers, doctors, machinists, roboticists, and so on and so on - there are thousands of subjects where expertise can be significant, recognised and appreciated - but their expertise has no direct relevance to the EU referendum so it makes them no better equipped to comment on it. But those from categories such as I listed in the previous paragraph
do have that additional breadth and depth of knowledge.
That's why I thought it was "telling" that the person who is the most senior member of the team responsible for reporting on "Politics" for the Financial Times, a very well respected newspaper, thought that calling the referendum was a "terrible mistake" on David Cameron's part. It's his job to analyse politics. I therefore place significantly more weight on his opinion than I would on some random person's.
Note too that I was careful in my original post to say that the comment (the one I quoted in full) was telling, not his whole interview.