Many seniors depend on it. I know a woman in her 70's that is nearly blind now. She worked her whole life and get $900 a month. A local "neighbor" fund run by the newspaper bought fuel oil for her or she'd have no heat. And Santorum thinks she needs to "share the pain"? She's barely eating as her taxes went up on her house. She doesn't have anything left to sacrifice.
My mother is in her mid 60’s and invested well so she doesn’t need it. She never counted on getting any SS, so she didn’t expect it and planned accordingly.