dittohead

Etymology
, coined by callers to Rush Limbaugh's radio show who begin their remarks with "Ditto!" or "Dittoes!" to concur with a previous comment without restating it.

Noun

 * 1)  A devotee of, his radio program, or his opinions.
 * 2)  Someone who mindlessly agrees with an idea, especially one who agrees only as a supporter of the person who expressed it.
 * 1)  Someone who mindlessly agrees with an idea, especially one who agrees only as a supporter of the person who expressed it.