It's new enough. Seven days does not an old poll make.
Zogby polls are terrible
At this point in time they all are. The real polls start in March. Those are the polls I'm waiting for. Everything until then is background noise.
All polls are getting less accurate. Fewer people have land lines, and fewer of those answer their phones. And they tend to be older people. Polls give you a broad picture, that’s all. Trump seems to have about a quarter to a third of the primary voters at this time. Whether it shows more towards one end or another probably just has to do with that particular sample, not any real movement. But over time if they all show the same pattern, it’s probably real.