David Brooks reflected on being addicted to polls recently. Part of an addict's problem is that he/she doesn't get the effect that he used to. We're not getting the same kick; so we try harder. The problem is not totally with ourselves however; the poll signals aren't as good. People can't be reached as reliably; so 'we' can't poll as well. We don't know when we know.

Nate Silver - 538

Measuring the Effect of the Economy on Elections.