I only punch down when I have a personal interest in putting the boot in. Or I feel like it. I personally consider blog wars to be a zero-sum kind of situation: somebody’s going to be wasting his or her time in participating in one, and it’s usually the person with more reach, readers, or reputation. For that matter, I think that the larger left-sites are mostly there to try to distract folks on my side from going after Left-politicians and opinion leaders; and when you’re playing this game you try to tackle the opposing team, not their cheering squad*.
Whether I’d feel this way if I wasn’t part of RedState (which is a website that everyone by now ranks as one of the top political blogs out there) is, of course, another question entirely. One that I will ignore with dignity.
*Unless they offer you a gratuitously free hit, mind you.