Here, for Reuters:
"There is no gainsaying that the basic purpose of the [Ryan] budget is to dismantle New Deal and Great Society programs that assist the poor and gradually remove the juice from the third rail by privatizing Social Security and essentially voucherizing Medicare. To save the country from the flood of debt, they must save us from FDR and LBJ."
The Ryan Budget isn't even the law of the land because Democrats have stopped it in the Senate. But for two years, two years!, Democrats have enthusiastically advocated and voted for reductions in the payroll tax, removing the juice from Social Security, in order to put cash into people's hands and stimulate the economy. Democrats did this in the lame duck session in December 2010, when they still had complete control of the US government: House, Senate, White House:
Looks to me like Democrats represent the biggest threat to the sacrosanctity of Social Security.