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:
humans shed so much DNA that unless a politician lived in a plastic bubble he couldn’t shield his DNA from prying eyes. Politicians will probably pass laws making it a crime to involuntarily disclose a politician’s genetic traits. But since it would take only one person to leak the information onto the Internet, and given that any serious candidate for President will have many enemies, candidates’ genomes will undoubtedly become public.
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.