“The reason this election swung so much to Donald Trump is that we had severe inflation at the beginning of the Biden presidency, people pinned that (incorrectly) on Biden”

No… This goes back to 1992: “It’s the economy, STUPID!”

After 3% inflation on top of 3% inflation on top of 9% inflation, people told Biden they were hurting.

Biden’s reaction? “We now have the strongest economy in the world.”

https://www.whitehouse.gov/briefing-room/statements-releases/2024/07/25/statement-from-president-joe-biden-on-second-quarter-2024-gdp/

When Harris was asked if she’d do anything different, she said:

“There is not a thing that comes to mind,” Harris said. “I’ve been a part of most of the decisions that have had impact.”

https://www.nationalreview.com/news/not-a-thing-that-comes-to-mind-harris-says-she-wouldnt-do-anything-differently-from-biden-over-past-four-years/

You can’t dismiss valid economic concerns and expect to be re-elected.

TL;DR Inflation in 2021 got incorrectly blamed on Biden. Most incumbents in democracies worldwide got a popularity hit in the past 2 years.