The Public Access to Public Science Act has been introduced in the House of Representatives.
Here's an excerpt from the announcement:
Congressman Jim Sensenbrenner (R-WI) and Committee on Science, Space, and Technology Ranking Member Eddie Bernice Johnson (D-TX) today introduced the Public Access to Public Science (PAPS) Act. This legislation would ensure public access to published materials concerning scientific research and development activities funded by federal science agencies, including the National Aeronautics and Space Administration (NASA), the National Science Foundation (NSF), the National Institute of Standards and Technology (NIST) and the National Weather Service (NWS). An embargo period is included to help balance publishers' needs with public access goals. PAPS builds on efforts by the Office of Science and Technology Policy (OSTP).
Read more about it at the Harvard Open Access Project's "Notes on the Public Access to Public Science Act."