In 1992 New York businessman Haim Katz called AIPAC President David Steiner pretending to be a potential donor. Katz secretly taped the call. Steiner described how AIPAC helped direct campaign contributions to friendly politicians. He also said he met personally to "cut a deal" with Secretary of State James Baker for $3 billion in foreign aid to Israel. Plus "a billion dollars in other goodies that people dont even know about."
More to the point Steiner told Katz "we have a dozen people in [Clinton's] campaign, in the headquarters... and theyre all going to get big jobs." Steiner was forced to resign after Katz went public. He later said his statements were not true. But the authors say there is little reason to doubt the thrust of his remarks.
AIPAC also vetted presidential advisers. In 1987 former AIPAC head Tom Dine told an interviewer "This is an actual example... One of the [1988] presidential candidates called us and said I will be publicly declaring soon, and I am interested in hiring so and so for a top campaign position. Tell me what you think about him." Dine said his answer was thumbs up in that case.
Jimmy Carter wanted George Ball as his first secretary of state. But he knew Ball was perceived as critical of Israel and that the lobby would oppose the appointment.
Richard Marius was a Harvard lecturer hired in 1995 as Vice President Al Gore chief speechwriter. He said he was fired before he began work. This happened after New Republic publisher Martin Peretz falsely claimed Marius was an anti-Semite based on a book review Marius published in 1992.
In 2001 Bruce Riedel left his position handling Middle East issues on National Security Council. The New Republic reported that Pentagon held up appointment of Riedel designated successor Alina Romanowski. Pentagon officials suspected her of being "insufficiently supportive of the Jewish state."
So the lobby does not only lobby. It decides who gets key jobs in the US government. And it blocks people it sees as critical of Israel.
Source: The Israel Lobby and U.S. Foreign Policy, 2007, a book written by John Mearsheimer and Stephen Walt