Does anyone know the names of any economists that are in favor of removing the Social Security income cap (and maybe a link to an article where they state this)? I thought Paul Krugman was in favor of it, but then I saw a video clip where he said that it's a mistake for Obama to consider this.

I am NOT looking for a debate about the merits (or lack thereof) of this idea. I am writing a term paper and I need some names/articles for research purposes. For some reason I seem to be having trouble finding this in the vast ocean of SS information available on the net.

Thanks!