Neilsen has published some fascinating details on how the presidential candidates are spending their media money and what kind of results they're getting for it. MarketingCharts.com has the numbers; here are some highlights:

As more and more candidates declare their intention to run for president in 2008, more and more Americans will turn to search engines like Google and Yahoo! to find their websites.

So, at a minimum, I expected all 17 of the presumed candidates to have purchased keywords. To my chagrin, only six candidates have taken the plunge. And if you take a closer look, it’s the Republicans who are doing a significantly better job of using search to communicate with the electorate...