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The "Koch Brothers Exposed" campaign released this video featuring Senator Sanders connecting the dots between the Koch brothers, "think tanks" they fund like the Cato Institute, and the common beltway pundit attacks on Social Security. It's worth watching.
And remember that as the campaign's website points out,
Social Security is so valuable because it provides a guaranteed benefit. Privatizing Social Security would remove this guarantee and have people gamble their retirement savings in the casinos of Wall Street.
This only benefits the fat cats of Wall Street like the Koch Brothers.