Ahead of the third anniversary of the Capitol riot, President Joe Biden traveled to Pennsylvania to unveil his 2024 reelection campaign’s opening pitch: A choice, in his words, between “preserving and strengthening” American democracy under his leadership and the “revenge and retribution” of a second Trump term.

“The choice is clear: Donald Trump’s campaign is about him. Not America, not you,” Biden told supporters during his first campaign speech of the year near Valley Forge.

Pennsylvanians don’t seem to be buying his pitch. Five months from Election Day, the 81-year-old incumbent’s message appears to be falling flat with voters — endangering not only his reelection prospects but also down-ballot Democrats in the Keystone State who are running for reelection alongside him.

A New York Times/Siena College/Philadelphia Inquirer poll released this week found Biden trailing Trump among registered voters in five of the six most competitive presidential battleground states, including Pennsylvania, where he’s lagging Trump among registered voters by about three points. That survey is not an outlier: Trump is narrowly leading the RealClearPolitics presidential polling average in the Keystone State, a harrowing sign for Biden in the crucial battleground he narrowly carried in 2020.

Biden’s unpopularity could also present serious electoral risks for . . .