I don't think this would apply to genes greatly predisposing a candidate to being a sociopath. (The h+ article focuses on these kinds of genes.)
If, hypothetically, Sarah Palin was identified as having genes that made it 70% likely that she was a sociopath, it would get reported by CNN. Bill O'Reilly would yell about how it's easy to tell that Sarah Palin is not a sociopath if you actually spend five minutes with her, rather than getting all your information filtered by the liberal media. Liberal groups would yell about how this confirmed all of their suspicions that Sarah Palin was a lying manipulator. Conservative tea partiers would make comments about "liberal evolutionist scientists" ...
I wrote an article for h+ predicting that the rapid fall in the cost of gene sequencing will allow U.S. voters to learn much about presidential candidates' DNA. The candidates won't be able to stop this because:
DNA analysis has a decent chance of reducing political bias by providing objective information about candidates. If, for example, 70% of the variation in human intelligence is determined by identified genes then DNA analysis would reduce disagreements among informed voters over a candidate's intelligence.