A constellation of left-leaning nonprofits and “super PACs” are raising tens of millions of dollars to pave the way for Hillary Rodham Clinton’s presidential campaign — and nearly all of them have paid Mary Pat Bonner a cut.

Over the past several years, the groups, which include American Bridge 21st Century, Media Matters for America and the super PAC Ready for Hillary, have paid Ms. Bonner’s consulting firm in excess of $6 million to help them cultivate wealthy donors and raise money, according to tax filings and campaign disclosures.

Ms. Bonner’s contracts give her firm a commission, typically 12.5 percent, on any money she brings in. Her tenacity, ties to wealthy givers and mastery of making donors happy have made Ms. Bonner, 48, among the most successful practitioners of a trade that is virtually invisible to voters but has taken on immense power and influence in the post-Citizens United world.

Almost every candidate for high office must now court ultrarich donors to finance super PACs. And with each party more reliant than ever on networks of outside groups to supplement its advertising and opposition research, fund-raisers like Ms. Bonner hold the keys to the big-money kingdom.

“The Bonner Group gets us the best fund-raising product for the lowest cost,” said David Brock, the founder of the monitoring group Media Matters and the super PAC American Bridge. “In my experience, the commission incentivizes the fund-raiser to meet the ambitious goals we set.”

MadlyMad February 6, 2015

Candidates being sold to us like new or used cars. The wealthy pushing their puppet over an other and supporting them every inch of the way…

Jack Belicic February 6, 2015

All these lamentations about the Supreme Court; when panhandling, sleeping on the sidewalks and burning US flags is protected speech under…

But the growing influence of paid fund-raisers has angered donors in both parties, who are skeptical of Washington’s consultant class and the secret, often lucrative deals they reach with campaigns.

Some organizations, like Freedom Partners, overseen by the conservative billionaires Charles and David Koch, emphasize their reliance on salaried staff members to raise money.

“I want my money to go to the candidate, to get them elected; I don’t want it to go to middlemen,” said Andrew Sabin, a prominent Republican donor.

Several Republican presidential contenders are now courting Spencer J. Zwick, Mitt Romney’s finance chairman in 2012. But some former donors grumble about the fund-raising fees paid by Mr. Romney’s campaign committees to limited liability companies established by Mr. Zwick: about $34 million, according to campaign disclosure reports.

In an interview, Mr. Zwick declined to describe his own fee. But he said that the bulk of the payments collected by the companies were in turn paid out to more than 50 other fund-raisers employed by the campaign.

“We raised more money than has ever been raised before at a better cost of fund-raising than has ever been done before,” Mr. Zwick said.

But few fund-raisers seem to command commissions as generous as Ms. Bonner’s. Political fund-raisers are typically paid monthly retainers, which can reach $25,000 a month during campaigns. The Bonner Group is paid almost exclusively on commission, a practice that is legal but frowned upon by some fund-raising consultants, who say it leads to fights with clients and other consultants over credit. It is considered unethical by the Association of Fundraising Professionals, partly because it can encourage abuses and, in the charity world, places self-gain over philanthropy.

“I think it’s a breach of fiduciary responsibility to pay fund-raisers on commission,” said Cindy Darrison, a professor at the George H. Heyman Jr. Center for Philanthropy and Fundraising at New York University.

Allies say Ms. Bonner and her 20-member firm are worth the expense. The Bonner Group maintains a database of 70,000 donors and collects detailed information on their past giving, their families and their political relationships. Many praise her energy and personal touch: thank-you notes, for example, or tickets to Broadway shows.

“Without Mary Pat, we would never be where we are today,” said Craig T. Smith, a senior adviser to Ready for Hillary. Mr. Smith said the group had paid Ms. Bonner and some other fund-raisers a single-digit percentage of money raised.

Ms. Bonner, who cut her teeth as a campaign aide and fund-raiser for former Vice President Al Gore, is also known among colleagues for her aggressive tactics. During the 2012 campaign, Ms. Bonner, who was raising money for American Bridge, clashed repeatedly with other Democratic super PACs over joint fund-raising efforts.

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