WASHINGTON — It was arguably one of the most important decisions she’s made in public life. Now Hillary Clinton says in the most emphatic terms ever that her vote to authorize war in Iraq was flat-out wrong.

“I thought I had acted in good faith and made the best decision I could with the information I had,” Clinton wrote in her new book, “Hard Choices,” released this week. “And I wasn’t alone in getting it wrong. But I still got it wrong. Plain and simple.”