Still, Mr. Reid’s call to end caucuses is a remarkable statement from the man who is single-handedly responsible for Nevada’s caucuses occupying the third slot on the Democrats’ presidential nominating calendar.

He engineered Nevada’s shift to earlier in the year, just behind Iowa and Hampshire, for the 2008 presidential cycle. Nevada has since become ensconced, with those two states and South Carolina, at the beginning of both parties’ nominating processes.

The Nevada Democrats have been slow to count and report caucus results partly thanks to new D.N.C. rules that require caucus sites to report not just the number of delegates won by each candidate, but also the raw number of supporters for each candidate.

The presidential campaign of Pete Buttigieg, the former mayor of South Bend, Ind., on Sunday cited “irregularities” in the results reported by Nevada Democrats and called on the state party to release a raft of new data. The results reported so far show Mr. Buttigieg in third place.

Both the Sanders and Buttigieg campaigns voiced grievances after Iowa’s caucuses and pointed to math errors in the allotment of delegates from precincts across the state. Iowa Democratic Party rules, however, declared that the caucus worksheets served as the official records, even if the math was incorrect.

Mr. Sanders, who lost Iowa to Mr. Buttigieg by a fraction of a delegate, claimed victory anyway because the raw supporter totals — recorded and released for the first time this year — showed him with 6,000 more votes than Mr. Buttigieg on the caucuses’ first alignment.

Nevada Democrats have previously sought to shift from a presidential caucus to a primary, but Republicans in control of state government have refused to fund presidential primary elections. Democrats now control every level of state government in the state, after Gov. Steve Sisolak won the governorship in the 2018 midterm elections.