(YouTube link)
Conan O'Brien officiated a same-sex wedding on his TV show last night. Whether that is big news or not, the way the story has been covered shows how much television news depends on someone else to write their scripts news copy. There's another video at Laughing Squid that synchs the newscasts so they repeat the phrase in unison. Link
lol
Of course a good PR person has always known how to manipulate the system. Send your release to the news desk so late that they don't have time to do any work on it, but not so late that it won't make it out. With printed news and old fashioned TV this was pretty easy to do. Which is why a story would change between the early and later editions or the 6pm and 10pm news.
When rolling news came along what should have happened is that the story would go out almost per press release the first time and then get worked on through the day. This does not seem to happen.
Their used to be a saying that a good news story almost writes itself. It would seem that modern "journalists" have misunderstood this maxim.