"Liberals had more brain activity and made fewer mistakes than conservatives when they saw a W"
to
"Based on the results, he said, liberals could be expected to more readily accept new social, scientific or religious ideas."
!
As the article notes, political orientation is correlated with a lot of things: income, education, religion, race/ethnicity, etc. Even if they tried to control for any possible confounding variables (the article doesn't mention whether they did), I'm very skeptical that they've successfully isolated a causal relationship between liberalism/conservatism and some innate brain capacity that makes you good at pressing a button at the right time.