Hint: it’s not Republicans.
Social Security remains one of the greatest achievements of the Democratic Party since its creation 75 years ago. Although Republicans have historically fulminated against the program (Ronald Reagan once likened it as something akin to “socialism”), they have actually made little headway in touching this sacred “third rail” in American politics. President Bush pushed for partial privatization of the program in 2005, but the proposal gained no policy traction (even within his own party) because Social Security continues to be hugely popular with American voters. It’s a universal program that benefits all Americans, not a government handout to a few privileged corporations.