Article title in The Post Chronicle: Liberal Gene Discovered: Is Being Liberal Decided At Birth?
Article title at their linked source, ScienceBlog: Researchers find a ‘liberal gene’
Original article title: Friendships Moderate an Association between a Dopamine Gene Variant and Political Ideology
A choice quote from the abstract:
Here, we hypothesize that individuals with a
genetic predisposition toward seeking out new experiences will tend to be more
liberal, but only if they are embedded in a social context that provides them
with multiple points of view.
Note that they didn't discover a gene at all. They did show that, among people with a genetic variant already known to predispose people toward novelty seeking, having more friends is positively correlated with self-reported liberal ideology (and among people without the variant, there is no correlation between ideology and number of friends).