Page 1: Biden, Williamson and link to an article Google hides campaign sites of Trump, RFK Jr. and other Republican candidates
Page 2: Biden again, Pence
No further pages. 5th result contains an article that claims to be linking all presidental candidate websites, but it's a Medium, hidden behind sign-up. I haven't find any result with a comprehensive list of the websites of interest. Kagi does aggregate results from Google and Yandex, so this is probably not too surprising.
Did it give you a result leading directly to their canonical campaign website? I can see Sanders and Clinton with international, but can't see DeSantis nor any other Republican candidate (not even Pence).
I can definitelly see pages with lists of candidates, but I couldn't find a single one that would also link their websites and thus satisfy the query, at least indirectly.
The results seem to change as we speak. I no longer have any republican candidates on the first page of search results, but the links in the results are to the canonical campaign sites.
Page 1: Biden, Williamson and link to an article Google hides campaign sites of Trump, RFK Jr. and other Republican candidates
Page 2: Biden again, Pence
No further pages. 5th result contains an article that claims to be linking all presidental candidate websites, but it's a Medium, hidden behind sign-up. I haven't find any result with a comprehensive list of the websites of interest. Kagi does aggregate results from Google and Yandex, so this is probably not too surprising.