Plagiarist

[Sarah]

One who plagiarizes; or purloins the words, writings, or ideasof another, and passes them off as his own; a literary thief; aplagiary.

[Sarah]

one who uses another words as his or her own, failing to acknowledge the source...like Barack Obama did when her lifted phrases word for word from speeches given by Mass. Gov. Patrick Duval.

Plagiarists should not be presidents.

[Donald Trump]

a person who uses another persons ideas or work and pretends that it is their own: