from the Washpost article:
Rudy, identified as "Staffer A," stands out in particular, because Ney and Volz had been previously identified as targets. Such prominent attention on a "staffer" has led experts on white-collar crime to conclude that the government's 40-member task force on public corruption is seeking Rudy's cooperation, just as it secured the cooperation of Abramoff and another former DeLay aide, Michael Scanlon.
"They're doing it in steps. They go to the staff and roll the staff onto the members," said Stanley M. Brand, a former general counsel to the House, who described DeLay's legal problems as "extreme."
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The Abramoff plea agreement twice cites "Staffer A" -- identified elsewhere as Rudy -- first in a section on Abramoff's corruption of public officials and then on the fraudulent bilking of a liquor company. The first citation would be of particular concern to DeLay because the events unfolded while Rudy was the majority whip's second-in-command.