It's time to let the voters play DJ. (Photo by Jeremy Ryan)

20:  number of Republican presidential primary debates held over the past year

839:  number of unique questions asked at those debates

109:  number of questions about “how conservative” candidates are

3:  number of questions about the Keystone XL pipeline

2:  number of questions about climate change

1:  number of questions about pizza crust

Those are some of the findings of journalism students at NYU’s Studio 20, led by professor Jay Rosen. They analyzed all of the questions journalists asked at the debates and broke them down into topic areas. Only 1 percent got categorized as fluff (e.g., when Herman Cain was asked, “Deep dish or thin crust?”), but many of the questions focused on the horse-race aspects of the primary — polls, negative ads, flip-flops, campaign strategy, “electability” — and not on the kinds of substantive issues that most Americans are actually concerned about.