Drummer in the Dark (Marcus Glenwood Series #2)

In T. Davis Bunn's "clever mix of politics, morality, and high-tech suspense" (Publishers Weekly), an ordinary man is asked to take on an extraordinary job: step in for a Congressman and defeat a bill. But the more he learns about the task, the more he suspects he's being set up. And the harder he fights his opponents, the deadlier the game.