What's the best Blog/CMS platform for a newspaper?

I’m evaluating software to provide a charity newspaper with a website. Self-hosted blogs like Blogger, Wordpress, and Tumblr are top considerations, but there are a lot of platforms these days. This is a typical 4–6 page street paper which publishes stories written by readers. Ability to customize appearance is a given. A multi-editor system with drafts, and unprivileged editors would be great!