Searches also clustered around [abortion], a question Schieffer posed earlier. In fact, of all the search queries emerging during the debate, Roe v. Wade was the most popular. Senator McCain's state-based approach to the issue sent many searching for more information on federalism, and subsequent discussions of partial-birth and late-term abortion prompted queries too. The conversations around nominations to the Supreme Court inspired many to search for litmus test and Justice Breyer.
While the volatile global economy and high energy prices may dominate news headlines, viewers sought more information about the topic of the evening's last question: education. People dug deeper into the issue of charter schools and school vouchers; some searched explicitly for school vouchers vs. charter schools. Senator McCain raised the example of Washington, D.C., schools, prompting many to explore the issue further, searching for Michelle Rhee, who is D.C.'s Chancellor of Public Schools. Other education-related searches included No Child Left Behind, Troops to Teachers, Head Start, and Teach for America.

And finally, here's a summary of sorts: these queries show the biggest overall spikes in search activity throughout the entire 90-minute debate.