While Buttigieg published a list of bundlers on his website last week, the campaign privately circulated the names of people in its “Investors Circle” — fundraisers who had raised at least $25,000 — in a finance update this summer. The 20 people and couples on that document who weren’t on Buttigieg’s public bundler list last week are: Andrew Tobias of New York; Barbara and Rodge Cohen of Irvington, N.Y.; David Winter of New York; Didem Nisanci of Washington; Eli Cohen of Chevy Chase, Md.; Eric Schieber of Chicago; Freddy Balsera of Miami; Genevieve and Robert Lynch of New York; Hamilton South of Cornwall, Conn.; Jack Connors of Boston; John Petry of New York; John Phillips of Washington; Jordan Horowitz of Los Angeles; Kelly Bavor of Atherton, Calif.; Kyle Keyser of Atlanta; Nicole Avant of Los Angeles; Stephen Patton of Chicago; Ted Dintersmith of Charleston, S.C.; Tom Gearen of Chicago; and William Rahm of New York.

Buttigieg has combined the power of low-dollar online fundraising and big events with wealthy supporters to become one of the most successful fundraisers in the Democratic field. He has raised $51 million in his bid for president as of Sept. 30, the most recent fundraising deadline, with 47 percent of the contributions coming from donors who gave less than $200.

But as Buttigieg’s poll numbers have risen in Iowa and New Hampshire, critics on the left are accusing the South Bend, Ind., mayor of failing to live up to Democratic Party ideals. Protesters picketed outside a Buttigieg fundraiser in New York last week, chanting “Wall Street Pete.” Warren, who is competing with Buttigieg for the top spot in February’s Iowa caucuses, has been particularly critical, calling out Buttigieg for offering donors “regular phone calls and special access.”

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Buttigieg recently began allowing media access to his campaign fundraisers in response to some of that criticism.

Buttigieg, who like other candidates is racing to bank millions of dollars to spend on television and field staff in Iowa and other early voting states, has continued hitting high-dollar fundraisers at breakneck speed between his campaign stops. On Monday morning, the families of several of Silicon Valley’s biggest executives — including spouses and relatives of Netflix CEO Reed Hastings, Google co-founder Sergey Brin, former Google CEO Eric Schmidt and Facebook Chief Operating Officer Sheryl Sandberg — assembled in Palo Alto, Calif., for an event supporting Buttigieg.

The night before, Buttigieg was in Napa Valley, where Buttigieg and donors dined under a chandelier adorned with 1,500 Swarovski crystals in cavernous room known as a “wine cave.” “Needless to say, we will never have a fundraiser at a wine cave,” Sanders’ campaign wrote Monday in a fundraising email to supporters.

Speaking to the crowd in Napa, Buttigieg urged his donors to redouble their work.

“I’m asking to you to work to share whatever it is that brought you here to those that may have gotten a little more cynical about the whole thing,” Buttigieg told the donors. “If we do that, as bleak as things are in our country circa December 2019, my hope and my faith is that, in a few years, we’ll be able to look back on 2020 with pride.”