Is Social Security a Ponzi scheme?

Critics of Texas Gov. Rick Perry responded with outrage when he compared Social Security to a Ponzi scheme. Is Perry right? Or is it time he toned down the political rhetoric? The DC's Michelle Fields explains:

Read more: http://dailycaller.com/2011/09/15/is-social-security-a-ponzi-scheme-video/#ixzz1Y3P8xAqv