This ruling changed copyright law and fair use. Adding your own original content, if it leads people to read your blog rather than click through to the AP article, enhances the claim of copyright infringement because your blog is now competing with the AP as a substitute source for news. Your original content no longer enhances your fair use defense, as it did before this ruling, but now enhances the copyright holder's claim of infringement. RTFA!
We're not talking about what Meltwater did. We're not talking about blogs that mindlessly copy and paste content. We're not talking about what used to be considered fair use before this new ruling that changed the law. We're talking about the new standard laid down by Judge Denise Cote that would make copyright infingers of every ordinary blogger who played by the rules of what the rules were last week.
That new standard is that if people might view your blog as a place to read the news, you are guilty of copyright infringement if you quote as much as a single sentence of another person's news article. RTFA!