It's just that DM is a more-than-century old, award winning, high-circulation British newspaper. This isn't some guy's blog.
Daily Mail's circulation is 1,579,289 making it the second biggest paper in the UK. It's got three times the circulation of the Washington Post.
If Daily Mail does not count as legitimate news source, then NOTHING in the US counts as "legitimate" to put in the "News" topic. Certainly not the so-called "Newspapers of Record".
Noting what you consider conservative news reporting.
http://www.dailymail.co.uk/news/article-2537705/Man-wakes-mortuary-15-hours-pronounced-dead.html