From This Town, by Mark Leibovich, pg 163:
Calculations vary on how many former members of Congress have joined the influence-peddling set. By the middle of 2011, at least 160 former lawmakers were working as lobbyists in Washington, according to First Street, a website that tracks lobbying trends in D.C., in April 2013. The Center for Responsive Politics listed 412 former members who are influence peddling, 305 of whom are registered as federal lobbyists. Hundreds more were reaping huge, often six-and seven-figure salaries as consultants or “senior advisers,” those being among the noms de choice for avoiding the scarlet L. In addition, tens of thousands of Hill and administration staff people move seamlessly into lobbying jobs. In a memoir by disgraced Republican lobbyist Jack Abramoff, the felon wrote that the best way for lobbyists to influence people on the Hill is to casually suggest they join their firm after they complete their public service. “Now, the moment I said that to them or any of our staff said that to them, that was it, we owned them,” said Abramoff, who spent forty-three months in the federal slammer after being convicted on fraud and conspiracy charges. “And what does that mean?” Abramoff continued. “Every request from our office, every request of our clients, everything that we want, they’re gonna do. And not only that, they’re gonna think of things we can’t think of to do.”
Mark Carrigan 