great speech, too late

Everyone's been saying what a great speech Hillary Clinton gave yesterday. It was probably the best of her campaign. So why didn't she give it earlier? Perhaps she should have taken Bob Kerrey's advice (as related by Joe Klein):

A few months ago, Kerrey told me that Clinton had called him asking for advice about how to proceed in the campaign. "Write your concession speech," he told her, then added, "But before you hang up let me explain: My concession speech [in 1992] was the best speech I gave in that campaign. Al Gore's concession speech was the best he gave. It's always the case because you're feel free to say what you really think when you're dropping out. So, write the speech--and then cut out the part about dropping out--and then deliver it."