The chant “We’re not going back” has become the rallying cry of Kamala Harris and Tim Walz as they continue their race for the presidency. It’s an explicit promise not to go back to Donald Trump-era policies, but there’s also a subtler implicit message: Harris is a fresh start for Democrats, too.

The only trouble with the mantra? For at least a few hours during next week’s Democratic National Convention, Harris (and the rest of us) will be going back.

That’s because NBC News is reporting that “President Joe Biden, former presidents Barack Obama and Bill Clinton and former Secretary of State Hillary Clinton have been confirmed as speakers at the convention.” President Jimmy Carter’s grandson is reportedly going to speak on behalf of his grandfather.

To keep the momentum going — and get the bump she needs heading out of the convention — Harris must run a flawless convention that is “unburdened by what has been.” But how do you do that when “what has been” wants one more curtain call?

This problem is not catastrophic or insoluble, but it does present hazards for a campaign that has been remarkably effective at........

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