CNN buried in scorn for asking final debate question on Ellen DeGeneres and George W. Bush's friendship
Anderson Cooper moderates Democratic presidential debate (CNN/screen grab)

Viewers lambasted CNN on Tuesday for using its time with Democratic presidential candidates to bring up Ellen DeGeneres' friendship with former President George W. Bush, who is considered to be a war criminal by some Democratic voters.

CNN asked about the friendship at Tuesday night's Democratic presidential debate, where moderator Anderson Cooper put the question to the entire field of candidates -- even though no questions had been asked about climate change or China.

Watch the video and read some of the Twitter responses below.