Others use words like “horrible” and “debacle” to describe a political environment that has gone from bad to worse over the last three months. Many fault the White House for steering President Biden too far to the left as he sought to pass social spending legislation stuffed with progressive priorities. Some see the president as a wounded figure who has failed to establish himself as the unequivocal leader of his fractious party.

“It’s going to be a terrible cycle for Democrats,” said Doug Sosnik, a former political adviser to Bill Clinton. Democrats have only a matter of weeks, he said, to try to alter the contours of a race that will largely be determined by factors beyond their control.

One sign of the alarm rippling through the party: Some Democratic politicians have begun creating distance between themselves and the president. Senate candidates are stampeding to break with the administration’s immigration policies, for instance. Other moves are more subtle, such as those of Gov. Gretchen Whitmer of Michigan, who quietly removed the president’s name from news releases about federally funded infrastructure projects.