Despite losing the Oregon primary while barely eking out a win in Kentucky, Hillary Clinton emerged with 51 of Tuesday’s delegates to Bernie Sanders’s 55. To reach the 2,383 needed for the nomination, Mrs. Clinton now needs only 92 of either the 890 still-to-be-elected delegates or the 148 still-unpledged superdelegates. This is because she is already supported by 524 superdelegates—the Democratic Party’s unelected overclass—to Mr. Sanders’s 40.

Still, she must be concerned about losing the FBI primary. If the bureau recommends...