Quotes are said by people and all news sources publish them on their websites. So, how can google consider that as duplicate content?
Yes, but that doesn't mean that Google is making the same decision about WHICH sites are the best ones to show in the SERPs. That's more of a site-wide decision, and Panda is definitely a site-wide algorithm, not just a page-by-page algorithm.
If the pages are essentially the quotation with not much else for content, that's a high duplication level. And Panda really didn't like duplication very much, especially when it's there on almost every page.