Amidst all the hand-wringing by pollsters over how they managed to get New Hampshire so amazingly wrong, John Zogby has put out a press release containing an interesting piece of information: The last one-day sample of his three-day tracking poll showed Hillary closing the gap in a big way -- but the sample was too small to be published on its own:

My polling showed Clinton doing well on the late Sunday night and all day Monday – she was in a 2-point race in that portion of the polling. But since our methods call for a three-day rolling average, we had to legitimately factor the huge Obama numbers on Friday and Saturday – thus his 12 point average lead. Unfortunately, one day or a day–and–a–half does not make a trend and we ran out of time.

Okay, so Zogby's got his story, and he's sticking to it. But what's the excuse for all the other polls that were using one or two-day samples? That list includes American Research Group, Suffolk and Marist — and they got it wrong, too.