Two Yahoo news headlines and the appropriate stories that follow: AP poll: Americans optimistic for 2007" and "Poll: Americans see gloom, doom in 2007."
Both stories were sent out by the AP about the same AP survey of 1,000 Americans interviewed by phone. It is not a case of a glass half full and a glass half empty. It is a case of a full glass versus an empty glass.
I would guess that the second story was written for the NY Times and the LA Times. So which paper was the first press release written for?