Philadelphia Debate the Most-Watched Yet

More than 10 million people watched Wednesday's Democratic showdown on ABC. Viewership peaked at 11.8 million, beating NBC and CBS programming. It was the first debate to air in network prime time on a weekday. Mark Halperin's overall grades: Obama B+, Clinton B. Read full report cards here. For each candidate's grades on substance, style and more-- along with excerpts from debate report cards-- click here.