The Associated Press reports that a federal law may limit how much BP has to pay for damages such as lost wages and economic suffering in the Gulf Coast oil spill, despite President Barack Obama''s assurances that taxpayers will not be on the hook. A law passed in response to the 1989 Exxon Valdez spill in Alaska makes BP responsible for cleanup costs. But the law sets a $75 million limit on other kinds of damages. Economic losses to the Gulf Coast are likely to exceed that. In response, several Democratic senators introduced legislation Monday to raise the liability limit to $10 billion, though it was not clear that it could be made to apply retroactively.