Bonus Episode: David Wasserman on the Release of the Historic Cook PVI and the Incredible Shrinking Swing Seat

In this bonus episode of The Odd Years, Editor-in-Chief of the Cook Political Report, Amy Walter (@amyewalter), chats with the Senior Editor of the US House of Representatives, David Wasserman (@Redistrict), about the release of the historic Cook PVI℠ and what the Partisan Voting Index — first developed by Charlie Cook in 1997 — tells us about how each state and district performs at the presidential level compared to the nation as a whole.