For Good and Ill, Donald Trump Has Brought Discussion of Political Impossibilities into the Open

From National Review:

Here’s a term you need to know — the “Overton Window.” Developed by the late Joseph Overton, a former vice president of the Mackinac Center for Public Policy, the “window” refers to the range of acceptable political discourse on any given topic. As the Mackinac Center explains, “the ‘window’ of politically acceptable options is primarily defined not by what politicians prefer, but rather by what they believe they can support and still win re-election.” The key to shifting policy lies not so much in changing politicians but in changing the terms of the debate. In other words, “The window shifts to include different policy options not when ideas change among politicians, but when ideas change in the society that elects them.”

The Left — dominating the media, the academy, and pop culture — is unmatched at moving the Overton Window. Consider gay marriage, a subject once so far outside the mainstream that less than 20 years ago, Republicans and Democrats united to pass the Defense of Marriage Act to define marriage under federal law as the union of one man and one woman. Now? That view is such an anathema that it’s difficult to get — or retain — a job in entire sectors of the economy if you openly hold to the traditionalist position on marriage.
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Then along came Donald Trump. On key issues, he didn’t just move the Overton Window, he smashed it, scattered the shards, and rolled over them with a steamroller. On issues like immigration, national security, and even the manner of political debate itself, there’s no window left. Registration of Muslims? On the table. Bans on Muslims entering the country? On the table. Mass deportation? On the table. Walling off our southern border at Mexico’s expense? On the table. The current GOP front-runner is advocating policies that represent the mirror-image extremism to the Left’s race and identity-soaked politics.

Critically, the Overton Window was smashed not by a politician but by a very American hybrid of corporate/entertainment titan — a man rich and powerful enough to be immune to elite condemnation and famous enough to dominate the news media. How many people can commandeer live television simply by picking up the phone and calling in? How many politicians can cause Twitter to detonate seemingly at will? While many of Trump’s actual proposals are misguided, nonsensical, or untenable, by smashing the window, he’s begun the process of freeing the American people from the artificial and destructive constraints of Left-defined discourse. Serious and substantive politicians like Ted Cruz will get a more respectful hearing, and PC shibboleths about allegedly boundless virtues of Islam and immigration will be treated with the skepticism they deserve.

It's a good thing that The Donald has completely re-defined the debate.