Here's one petition link with a list of participating organizations if you'd still like to add your name.
Isaiah Poole writes:
Social Security, Medicare and Medicaid are programs that are rightly “third rails” that should be untouchable for any politician who wants to diminish them. What we really need is a conversation about expanding Social Security for people in retirement and expanding Medicare to millions more people who are not being well served by the private insurance market.And, if you'd like to raise our nation's standards even higher, and into the 21st century and beyond, consider this blog link. That is, imagine a universal and unconditional basic income (UBI), at a liveable level, and in the U.S., coupled with Medicare for all.
A video of the petition being delivered:
*Photo credit, via UE, UE members demonstrating in Washington in 2010 to protect social security.