In contrast to what CNN tended to do previously, during the guest segments of his show he frequently has one guest or one perspective represented at a time. Instead of having balance "within" segments by having a two sides to every issue there's balance across segments.
This achieves a lot of things. First, it puts the responsibility back onto Blitzer, the host, to keep his guests honest rather than letting the feuding guests keep each other honest. Second, it allows more unfettered and uninterrupted viewpoints and information expressed. Third, I think it allows the guests to speak more freely as they aren't as much there to represent "a side" but instead they can express their own viewpoints. Sure, partisan hacks are still partisan hacks, but at the very least it allows for a bit more nuance in partisan hackery.
