It seems that the candidate decided that peeing on the third rail was a good idea:

Americans have got to understand that we are paying present-day retirees with the taxes paid by young workers in America today. And that's a disgrace.

Of course in their day, present-day retirees were working and their tax dollars were paying folks who were retired back then. And in exchange for that service when they were workers, today's retirees get to enjoy a secure retirement. Yes, on my dime. And in exchange I expect that when I retire, ensuing generations will be there for me. I call it generations looking after each other, so that those who built the present with labors in the past get to enjoy some of the fruits of their labor. The federal government calls it Social Security. John McCain calls it a disgrace.