A New York Times/Siena College poll painted a worrisome picture of the president’s standing with a crucial constituency. Democratic strategists warned that the erosion could threaten his re-election.
Voters in battleground states said they trusted Donald J. Trump over President Biden on the economy, foreign policy and immigration, as Mr. Biden’s multiracial base shows signs of fraying.
In interviews and polling, many Republican voters believe President Biden is so weak that picking the most electable candidate to beat him no longer matters.