I don't think Grimma's mother in law is stupid. I think she had never been previously exposed to the arguments and opinions in the Daily Mail. She has now started to read it and has found that she agrees with it.
The Daily Mail, the people's paper with the second highest sales in the country, is derided by the progressives, just as Sarah Palin is. They make jokes songs on youtube about the Mail and Palin. They call Palin stupid and think Mail readers have low intelligence. The reason they do this is because they want to discourage people from listening to Palin and reading the Mail, because they know that if they do, then just like Grimma's mother-in-law, they will find that they agree with Palin and the Mail, they will find that they agree with the majority of the people who buy the best selling newspaper, and disagree with the progressives.
The Guardian is a good newspaper, there is good news, opinion and comment in it, and it is written by clever journalists. We need the Guardian to do well, even if some of us think that some of it is propaganda. We need a broad spectrum of views. We need Grimma's mother-in-law to read all papers and decide for herself which views she agrees with. We don't want one side of the story, we don't want people to be put off listening to Sarah Palin or reading the Daily Mail because the progressives mock them. That is what the progressives want, not what the people want.