PHILADELPHIA — Several key mortgage companies that benefited from federal bailout funds have yet to sign onto the Obama administration’s plan to help more homeowners avoid foreclosure.

The community group ACORN held 15 protests around the country Tuesday to draw attention to the slow progress of the administration’s plan, which was launched four months ago. Demonstrators called for the companies, including Litton Loan Servicing, HomEq and OneWest, to sign onto the Obama administration $75 billion initiative called "Making Home Affordable."