it has been shown that more than 20% of undecided voters can be manipulated into voting one way or the other, by simply manipulating the rankings of search engine results.

Given that many elections are won by small margins, our results suggest that a search engine company has the power to influence the results of a substantial number of elections with impunity. The impact of such manipulations would be especially large in countries dominated by a single search engine company.

https://rwmalonemd.substack.com/p/google-has-usurped-democracy?

AND

The search engine manipulation effect (SEME) and its possible impact on the outcomes of elections

https://www.pnas.org/doi/full/10.1073/pnas.1419828112