To understand the partisanship and bitterness of American politics today, you have to consider what happened in 1994. Steve Kornacki, National Political Correspondent for NBC News and MSNBC, steps back from the Big Board to tell the origin story of the 1994 Republican “revolution,” the midterm election when the GOP took the House majority for the first time in four decades. It was set in motion by Georgia Congressman Newt Gingrich, who — over the course of 15 years — pushed Republicans in a direction of confrontation and conservatism. Steve talks with Newt’s allies and adversaries about...