There's been a lot of controversy lately about Google's objectivity when it comes to Hillary Clinton...something about code, preferences, algorhthyms...
Not sure what to think, until I tried this.
Search term for Google: obama's embarrassing radio appearances
This produced interesting results, viewable here, most of which are somewhat, shall we say, complimentary of Barack Hussein Obama, with links to how embarrassing Trump is and "embarrassed" Obama is for Republicans.
Bing's search results were quite different, viewable here.
Yahoo's search results were also quite different, viewable here, same search terms.
Similar at Dogpile.
Try it yourself.