The question came up this week at a political panel: Why don’t people like Hillary Clinton?

Why do they always believe the worst? Why, when some supposed scandal breaks and someone says she’s hiding something, do people, including many of her supporters, assume it’s true?

The answer is that Mrs. Clinton has been in America’s national life for a quarter-century, and in that time people watched, observed and got an impression of her character.

If you give the prompt “Clinton scandal” to someone under 30, they might say “emails,” or Benghazi” or “Clinton Foundation,” or now “health questions.” But for those who are older, whose memories encompass the Clinton era, the scandals stretch back further, all the way to her beginnings as a national figure.

Seventeen years ago, when word first came that Mrs. Clinton might come to New York, a state where she’d never lived, and seek its open U.S. Senate seat, I wrote a book called “The Case Against Hillary Clinton.” It asserted that she would win and use the Senate to run for president, likely in 2008. That, I argued, was a bad thing. In the previous eight years she’d done little to elevate our politics and much to lower it. So I laid out the case as best I could, starting with the first significant scandal of Bill Clinton’s presidency.