Congress sent out a letter to the admin about nationalizing retirement: http://www.humanevents.com/2010/05/04/republicans-sound-alarm-on-administration-plan-to-seize-401ks/
That's really ancient news--that is May of 2010. The hearing was in the fall of 2012. My sense of things is that this is a non-issue--this is something the real extreme Left Wing fringe wants to pursue but it doesn't look to me like it is going anywhere. These are just fuzzies bouncing off the wall--even this Administration is probably not going to take on some thing like this.
Just my view--it might be wrong. If you see anything that looks like real current action, let me know and I will look into it. At present, I don't think it is going to happen in the current cycle and lots of other things are on the table as real threats.