Reporting from Washington - Mayor Antonio Villaraigosa's bid to secure federal funds for fast-track expansion of the Los Angeles region's transit system is gaining support from Washington officials who say it could serve as a national model for speeding economic recovery and reducing pollution and traffic congestion. The Obama administration and influential members of Congress are exploring ways to aid the car-clogged city with a federal loan, economic stimulus funds or other assistance so it can build 12 transit lines in 10 years instead of 30.