The New York Times runs a long piece on The Tech Lobby, Calling Again. Unfortunately, that lobbying seems to boil down to concern over stock option expensing. If the tech companies don't keep their eyes on bad legislation like the proposed Induce Act, they won't have stock options worth expensing.
As a bonus, the NYT quotes my high school classmate Auren Hoffman, who gets to the heart of Washington influence, the almighty dollar:
"I don't think political staffers are saying, 'You should be friends with well-known people in Silicon Valley because of the hipness factor.' I think they're saying, 'You should reach out as a long-run strategy for raising funds.'"