[kolchinski]

That's a fair point but seems like it's only part of the picture, I just did a bit more digging and it looks like the proportion of people who pick up has dropped by about 1/3 while the proportion of people who agree to participate after talking to the live pollster has dropped by 3x, a similar decline to the proportion who pay the Met. http://www.people-press.org/2012/05/15/assessing-the-represe...

Obviously though drawing conclusions from these two trends would be premature, so I'm hoping someone might think of numbers they've seen on similar topics, whether they align with these or not.