"Jack Abramoff is a classic example of the pay-to-play system carried out in the extreme," said Fred Wertheimer, head of Democracy 21, a campaign-finance watchdog group.
According to a study by the nonpartisan Center for Responsive Politics, 296 members of Congress since 1999 have received contributions from Abramoff, his Indian tribe clients or SunCruz Casinos. Abramoff and his wife contributed $204,253 -- all of it to Republicans.
In addition, Abramoff also leaned on his Indian clients to give to key lawmakers. The center found that Abramoff's clients gave almost $4.2 million, more than half to Republicans.
His most famous golf outings took members, including DeLay and Rep. Bob Ney (R-Ohio), to the fabled St. Andrews course in Scotland. Such trips are against House rules if they are paid for by a lobbyist. DeLay and Ney said they believed the trips were properly paid for by a nonprofit group, but prosecutors are reportedly looking at whether Abramoff initially picked up some of the expenses.
Favors done for DeLay and Ney have drawn particular scrutiny because they took aggressive steps to help Abramoff or his clients on issues that seemed remote from their own constituents' interests. When Abramoff was trying to buy the Florida floating casino fleet, Ney inserted a statement in the Congressional Record critical of Abramoff's rival.
Abramoff had been hired to stall legislation raising the minimum wage for the U.S.-administered Northern Mariana Islands in the Pacific Ocean, and DeLay was credited with helping him do so. DeLay also was an ally in Abramoff's effort to fight legislation to allow the taxation of Indian tribe gaming revenue.
DeLay and Ney, like other lawmakers who helped Abramoff, said they took action on the merits, not because they received favors from him.
The last time Washington lobbying came under such broad legal scrutiny was in the Abscam scandal of 1980, when an FBI sting operation led to the conviction of seven members of Congress on corruption charges.
That episode was widely viewed as a scandal involving isolated individuals, the proverbial "bad apples."
But some critics of the current campaign finance system say that the Abramoff scandal could have broader significance if it is seen as an indictment of a corrupt political system, not just individuals.