The Guardian view on the US presidential debate: Kamala Harris’s triumph isn’t transformative, but it was essential | Editorial

Donald Trump was unable to resist the vice-president's goading. Her commanding performance is another welcome campaign milestone

If presidential debates don't really matter, as some have contended, Kamala Harris would not have been on the stage in Philadelphia on Tuesday night. Yes, the spectacle can lead to excessive focus on their impact. But Joe Biden's disastrous performance, which triggered his withdrawal from the race, showed how these choreographed political events can catalyse, if not create, voters' sentiment about candidates.

Only weeks before the nation makes its choice, Ms Harris's success was critical. Debates are often remembered, as in Mr Biden's case, when things go wrong. The vice-president didn't merely clear the very low bar set by her boss - basic competence - but soared over it. Her desire to stick it to Donald Trump may not have elucidated matters for undecided voters who say they want to know more about her and her policies. She did mention a few, including measures to codify abortion rights and promote an opportunity economy", but was keener to focus on the broad messages.

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