The polarization has been increasing for at least five decades. It reflects increasing absorption of all political issues into a left – right, Republican versus Democrat contest and increasing disagreement between the parties. It has various effects. One of them is that State and local elections are being increasingly shaped by the national picture. People vote on the basis of their national party loyalties rather than even paying attention perhaps to whether the opposite state party might be actually a better choice. Among citizens most conservatives join the Republican Party while most people on the left join the Democratic Party. As a result, there is a much clearer ideological divide between the parties.
On top of that, there has been lately an aspect that can be called “negative partisanship”. People vote based on their dislike and distrust the other party. For instance, in the 2016 presidential election both Hillary Clinton and Donald Trump were disliked by substantially more people than they were liked by. For a substantial number of voters, it was a matter of choosing which one was disliked the least, rather than choosing affirmatively.
Conflict between the parties has also grown more intense. It started in the 1980s and the break down for example in norms around judicial nominations but it escalated through the 1990s with the Clinton impeachment. It continued in the 2000s with various attacks on both George W. Bush and Barack Obama. But it is at a still more dramatic level in the Trump presidency.
Indeed, there were voices about impeaching President Trump almost even before he was elected to President. Although impeachment is not unprecedented in US history, the constant threat of impeaching a President during his whole term is quite unique. How do you see these developments?
Let me push back slightly. One valuable aspect of the separation of powers is that the different branches of government check and balance each other. Congress is often involved in investigating a President. In this respect, there is nothing particularly new in the efforts of the President’s opponents to investigate potential scandals and bring those to light. The hope that these investigations will somehow damage the President politically is nearly a perennial in American politics. To a certain level it is even healthy.