Automate Posting same content to multiple Pages

We are trying to create a blog that will serve three or four distinct audiences, but with some similar interests. We will have a main page for posting, but may also want these posts automatically published to other pages of the same blog depending on the target audience.

So, we envision and author going to a dashboard, creating a post and then being able to check boxes (representative of site pages) to set which pages the content gets published to, allowing the ability to post that same content to more than one page at a time.

Hope that makes sense.

The only plugin that I can find seems to allow you to split one post onto multiple pages, but that is not what we are looking to do. We want to duplicate the same content across multiple pages. We would prefer not to have separate blogs, but pages on the same site.

Ideas? Links? Plugins for help?