Sounds about right to me: I find [being happy makes you likely to be libertarian] a plausible story. David Henderson points out that people on the left will complain about lack of choice in media and point to Fox News as an example. When he suggests that there are many other news outlets, the reply is "But some people only watch Fox News!" He concludes that the issue is not choice in media, but that people on the left are angry with other people's choices.