Many law blogs are running this ad:

Congress is considering removing mortgage interest deductions. Under US tax code, mortgage interest on your home is deductible. Congress is debating altering mortgage interest deductions, putting your homeownership at risk. Join AHAA and fight to stop Congress from squashing this deduction.

AHAA is the Association for Homeowners Across America.  They are asking folks to sign their online petition:

Mortgage interest deductions allow millions of homeowners like me to live the American dream and afford our own homes. By signing this petition I urge Congress to keep its HANDS OFF the mortgage interest deduction."