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Mr. Wilcox, who commented generally and not specifically to the situation unfolding in the District, said he has seen contributors use reciprocity deals - one donor gives to a politician in an affiliated donor’s city, and the favor is returned - to build a network for bundling.

“They say you start with the people who can’t say no to you, then move to people who just like to be part of the action,” Mr. Wilcox said. “It skirts the intention of the law, but it’s not illegal.”

Despite the hubbub, it is unclear if anyone involved in the investigation into Mr. Thompson’s campaign activities has done anything illegal or if any wrongdoing could climb the campaign hierarchy to besmirch a sitting politician.

Mr. Engle said that to charge a candidate or officeholder, a prosecutor would have to prove intent - “that the candidate knew the acts that were going on, knew those acts were illegal, yet knowingly participated in them and intended to benefit from them.”

Either way, it is rare to see “such an across-the-board investigation” among a body of lawmakers as is occurring in the District, he said.

“Maybe in Dashiell Hammett novels, but not here today,” he said, referring to the popular mystery writer from the early 1900s.

Some lawmakers in the District were quick to note that their campaign treasurers received the subpoenas, distancing themselves from the legal matter.

When New York City Comptroller John Liu found himself embroiled last month in allegations of using straw donors, it was his 25-year-old treasurer who was arrested.

Mr. Wilcox said the candidate can usually rely on “plausible deniability” to avoid criminal liability for activities during their campaign. It is the treasurers and bundlers who face the heat, because they were the ones angling for the plaudits and spoils that come with raising big bucks.

But D.C. Council member Jack Evans, Ward 2 Democrat and the first member to acknowledge his campaign’s receipt of a subpoena, said it is wrong for any official to push blame onto his or her campaign team.

“It’s the Harry Truman thing, right? ‘The buck stops here,’ ” Mr. Evans said. “At the end of the day, the ultimate person responsible is the candidate.”