By NBC’s Dave Carl
The name Gallup has been synonymous with opinion polling for decades. So why are some analysts questioning the survey giant’s methods? The Huffington Post’s Mark Blumenthal and Gallup Editor-In-Chief Frank Newport join Chuck for today’s “Deep Dive” into why some of Gallup’s numbers routinely stand out from other polls.
Need a deeper look into what’s causing the divide? The New York Times’ Nate Silver shows you how to calculate “house effects” on political polls.