Both Democratic presidential candidates, who promise to curb the influence of corporate lobbyists in Washington, helped enact narrowly tailored tax breaks sought by major campaign contributors.

Sen. Barack Obama's presidential campaign has accepted $54,350 from members of a law firm that in 2006 lobbied him to introduce a tax provision for a Japanese drug company with operations in Illinois, according to public records and interviews. The government estimates the provision, which became law in December 2006, will cost the treasury $800,000.

In 2002, Sen. Hillary Rodham Clinton introduced legislation at the request of Rienzi & Sons, a Queens, N.Y., food importer, according to company president Michael Rienzi. The provision, which became law in December 2004, required the government to refund tens of thousands of dollars in duty charged on imported tomato products, Rienzi told USA TODAY.