Tonight, Hillary Clinton and Barack Obama will debate in Ohio. It will be the 20th debate, and possibly the last, of the Democratic presidential campaign. Is there anything left to ask? The Opinion section asked five experts to pose the questions that they feel have not been answered over the course of more than a year of campaigning. Here's what they would ask the candidates if they were moderating tonight's debate. 

1. Both of you have argued for more widespread access to the Internet in schools. Given the recent "To Read or Not to Read" report from the National Endowment for the Arts, which revealed a steep decline in reading among young people, and the lack of evidence that computers in the classroom help students learn, wouldn't federal funds be better spent on projects that encourage reading and engagement with the arts?

2. The Internet is often praised as a liberating force in American culture, but it has also drawn comparisons to an unruly mob. Would you support a federally financed, long-term study of how our use of this technology is changing our behavior, for good and for ill?

3. You have both admitted to being BlackBerry addicts. How has this desire for constant connection and endless information changed your personal relationships and how has it transformed political culture?

— CHRISTINE ROSEN, a fellow at the Ethics and Public Policy Center and a senior editor of The New Atlantis: A Journal of Technology and Society.