I think libertarians probably found EY through Overcoming Bias, which they read because of Robin's affiliation with GMU.
(Note that Reason is a libertarian magazine)
I am familiar with Cato, Reason, and GMU. Of the GMU econ professors, I don't think Hanson is that famous among libertarians (especially compared to among transhumanists), as he writes about libertarian things far less often than, say, Bryan Caplan. (Try searching both of their names on Reason.) He's also not a guest lecturer at IHS, like Caplan, Cowen, Coyne, Klein, Lavoie, Nye, Smith, or White.
(Amusingly, even though I had known Robin for years as one of Bryan's gaming friends, I didn't find Overcoming Bias until a few months after I found LW, and then connecting that to Robin took a few more months.)
Original at Washington Examiner
http://washingtonexaminer.com/down-with-politics/article/2508882#.UGSscI0iYZm
Repost at Reason.com
http://reason.com/archive/2012/09/25/why-politics-are-bad-for-us