CNN:

The world’s most-used search engine is so powerful and national elections are so tight, that even a tiny tweak in Google’s (GOOGL, Tech30) secret algorithm could swing the 2016 presidential election, according to Robert Epstein, senior research psychologist at the American Institute for Behavioral Research and Technology.In an op-ed on Politico.com, Epstein said that he and a team of researchers studied behavior in undecided voters who had been exposed to rigged search results. By displaying results that shone a more favorable light on a particular candidate the researchers could shift opinion towards that favored candidate.