As a follow-up to yesterday’s post on the tendency of people to overrate polling for the Iowa caucuses and to underrate the importance of organization, I note (via Memeorandum) that both Sen. Hillary Clinton and John Edwards are taking issue with the latest Des Moines Register poll, which had Obama seven percent ahead of Clinton, while polls by CNN and Zogby both show Clinton clinging to a statistically insignificant lead. This sort of hubbub from the