Source: PAUL J. RICHARDS/AFP/Getty Images
Students play the part of candidates Barack Obama and John McCain in Nashville, TN.
Tonight's second presidential debate from Belmont University in Nashville is a town-hall format, meaning 100 undecided voters will pose questions to Senators McCain and Obama, moderated by Tom Brokaw. It's a time for the people to propel the debate, and odds are domestic issues will figure prominently. So, as a bit of a preview, we've got a crack team of NPR reporters covering the waterfront, so to speak: David Welna on Social Security, Julie Rovner on health care, and Claudio Sanchez on education. If you're one of the select 100 attending tonight's debate, maybe some background will help you better formulate your question... And if not, after our show you'll be able to call yourself an informed voter as you tune in tonight.