As a political pollster, I always observed that the poll that often got the most coverage was the one that was different from the others, regardless of whether it was right, or whether the pollster had any track record. This is true with opinions, too: those on the extreme right or left, or those that are the most titillating, seem to drive the most traffic through their sites. The center doesn’t seem to have either the edge or the passion to grab the same kind of traffic.

Mark Penn, former advisor to the Clintons and Tony Blair, in America’s Newest Profession: Bloggers for Hire