Nate Silver's 538 seems seems legit; even though it in servitude to The Mouse.
There're news and opinion (or half-pinion) sources and then there are aggregators. The original (and still best for moderation) aggregator is Slashdot.org.
But there exist sites like
www.allsides.com/unbiased-balanced-news The same stories are compared and contrasted from the Left, Center and Right.
An article on aggregators that mentions neither:
themeisle.com: 7 Great News Aggregator Websites You Should Check Out (Plus How to Build Your Own). But they do tell you how to roll your own with Blogspot.