How to search quotes using Google News Search:
" 1. To access these new features, first search for a person's name on Google News. If we have a recent quote, we'll show it above the search results.
2. Clicking on the speaker's name will take you to a page with even more of their quotes. From there you can search within the quotes by entering a query on the left side of the page."
Source: Google News Blog (check out the screen captures)