Former U.S. Ambassador to the United Nations Nikki Haley scooped her own presidential announcement. The day before national reporters were set to trek to Charleston, South Carolina, to watch her become former President Donald Trump’s first declared major rival for the 2024 Republican nomination, she sent out a video ending whatever suspense remained.Haley’s presidential ambitions were among the worst-kept secrets in Washington. Most media outlets reported that she was going to announce a White House bid on Feb. 15, two weeks in advance. Her travel schedule more or less confirmed it, with stops in Iowa and New Hampshire.That’s what it takes for a candidate to gain control of his or her own campaign narrative in 2023. The media assume a permanent campaign and presume probable candidates are running or not before they have gone through...