Former Vice President Joe Biden and Senator Elizabeth Warren of Massachusetts, who were widely considered the race’s principal contenders for most of last year, were staggered by showings even weaker than anticipated. “I think everyone thought two weeks ago that Biden probably had the best chance of building the coalition that could pull everybody together,” Simon Rosenberg, the founder of the Democratic advocacy group NDN, told me. “And right now, assuming that Biden is weakened, it’s not clear that anyone is going to be strong enough” to amass a coalition that can produce a delegate majority for the convention this summer.

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Biden’s campaign says it is ready to fight on in Nevada and especially South Carolina, with its large population of African American voters. But the extent of Biden’s collapse in New Hampshire, where he won less than 9 percent of the vote, has many Democratic strategists questioning whether he can forge a path back to relevance in the race. “I don’t see how he carries forward,” the veteran Democratic pollster Stanley B. Greenberg told me. “I think it’s too much of a repudiation.”

Biden’s precipitous decline will immediately shift more focus to former New York City Mayor Michael Bloomberg among party centrists skeptical of Sanders. Yet the release yesterday of an audio tape capturing Bloomberg defending in stark language the controversial stop-and-frisk policing tactic he employed in New York City underscores the ideological and racial obstacles he may face as the media and other candidates zero in on his record.

All of this stands in stark contrast to the past four Democratic nominating contests, when the race effectively resolved to a two-person battle after Iowa and New Hampshire. This year, the party faces the prospect of sustained uncertainty not only after the first two states, but even after the Nevada and South Carolina competitions still to come in February—and maybe even after Super Tuesday on March 3, when 14 states will vote.

“We’ll head into Super Tuesday without a lot of clarity and with Bloomberg representing an entirely new dynamic in all of this,” the Democratic pollster Geoff Garin told me. “This race is very, very different, where these first four states are setting the table for Super Tuesday but they are not the main event.”

If anything, the New Hampshire results spotlighted the obstacles confronting each of the candidates.

As he did in Iowa, another preponderantly white state, Buttigieg amassed by far the most balanced coalition—whether measured by age, ideology, or education—and finished a very solid second, only about 4,000 votes behind Sanders. But Buttigieg failed to consolidate a deep enough advantage with any one group to move his vote share beyond the 20 to 25 percent that he captured last week. Now he faces the stern test of competing in more racially diverse states after polls consistently have shown him attracting negligible support from African American and Latino voters.