Blowing the Tease

Here's what I heard last Saturday at 6pm in a local newscast:

"We'll tell you who Barack Obama picked as his running mate."

Given that they released the pick overnight, at 6p, th above is not an effective tease. Even worse, this tease was coming out of a national newscast. You can safely assume the audience watching the national newscast has already heard the big news. In fact, unless it's an ongoing story, why would you ever tease any national story coming out of a national newscast? The viewers have already heard about it in the last half hour. Pick an interesting local angle on the national story or something entirely different.