What do these things have in common: the birth of the Republican Party, the creation of the state income tax, environmental conservation and dark money politics? Wisconsin.

For decades, the Badger State was seen as a beacon of progressivism even when Republicans were in charge, but somewhere along the way that changed and now the state is a deep red.

So how and when did it happen and what does it say about the direction politics is heading in this country? Wisconsin native Dan Kaufman set out to connect the dots in his new book The Fall of Wisconsin.

GUEST: Dan Kaufman, author of The Fall of Wisconsin: The Conservative Conquest of a Progressive Bastion and the Future of American Politics