If this is a national poll, I bet they’re oversampling blue states.
The question is where they are state by state.
I’m hearing on Twitter and blogs (HotAir and Ace) that Obama’s bump is due to blue state fever. And they most of the swing state numbers have not moved. Which is good news.
They could sample any states you might choose. Then, to skew the numbers, all they'd have to do is poll just the cities