“Very long time ago”-—possibly before Mort Zuckerman bought the franchise in 1984.
But it appears that even Zuckerman is now having buyers remorse regarding Zero http://www.freerepublic.com/focus/f-news/2551594/posts
That sounds about the right time frame. I had subscribed to USSUNR in those days because it was the only newsmagazine that appeared even remotely non-partisan. Time and Newsweak had long before sold their souls to the lefties.
The change in "perspective" of the mag changed palpably, and I dropped my subscription shortly thereafter.