Believing it some sort of civic duty to watch President Trump’s 2026 State of the Union address, I considered fortifying myself first with a large rye whiskey on ice, but wisely chose instead President Abraham Lincoln’s Cooper Union address of February 27, 1860. The contrast with Trump’s speech was not so much dispiriting (though it was also that) as instructive, even inspiring. In 2004, the actor Sam Waterston recited the speech in the same Great Hall at Cooper Union, in New York City, where Lincoln had spoken, describing the exercise as “a kind of experiment to see if a speech like this could hold a modern audience’s interest.” The long standing ovation he received provided the answer. Waterston may be Cambridge born, but his voice that night had a prairie twang, and like Lincoln he was lanky, urgent, and utterly in earnest. The original speech addressed three audiences: skeptical easterners who wondered if the frontier lawyer was made of presidential stuff, those who agreed with Senator Stephen A. Douglas that the existence of slavery should …