Hillary Clinton and Donald Trump will soon announce their running mates—but does the vice president pick still matter? While it was once used as a way to bring regional balance to the ticket, it's not clear what the vice president selection means in 2016.

Tune in to the second episode of Politics & Polls as Professors Julian E. Zelizer and Sam Wang debate this issue and more.

Zelizer is the Malcolm Stevenson Forbes, Class of 1941 
Professor of History and Public Affairs at Princeton University's Woodrow Wilson School of Public and International Affairs. He has been one of the pioneers in the revival of American political history. He is the author of several books including, most recently, "The Fierce Urgency of Now: Lyndon Johnson, Congress, and the Battle for the Great Society." Zelizer is a frequent commentator in the international and national media on political history and contemporary politics. He has published over six hundred op-eds, including his weekly column on CNN.com. 

Wang is professor of neuroscience and molecular biology at Princeton University. He is known for his books "Welcome to Your Brain" and "Welcome to Your Child's Brain" and for his founding role at the Princeton Election Consortium, a blog providing U.S. election analyses. In 2004, Wang was one of the first to aggregate U.S. presidential polls using probabilistic methods. In 2012, his statistical analysis correctly predicted the presidential vote outcome in 49 of 50 states. He has also developed new statistical standards for partisan gerrymandering. A neuroscientist, Wang's academic research focuses on the neuroscience of learning, the cerebellum, and autism.