In recent months, media figures, including news reporters at CNN, The New York Times, The Wall Street Journal, the Chicago Tribune, and the Associated Press echoed Republicans by employing the word "Democrat" as an adjective to describe things or people of, or relating to, the Democratic Party -- including referring to the "Democrat" Party itself, even though that is not the party's name. The ungrammatical conversion of the noun "Democrat" to an adjective was the brainchild of Republican partisans, presumably an attempt to deny the opposing party the claim to being "democratic" -- or in the words of New Yorker magazine senior editor Hendrik Hertzberg, "to deny the enemy the positive connotations of its chosen appellation." In the early 1990s, apparently due largely to the urging of then-House Speaker Newt Gingrich (R-GA) and Republican pollster Frank Luntz, the use of the word "Democrat" as an adjective became near-universal among Republicans.
Hertzberg pointed out in an article for the August 7 issue of The New Yorker that the word "Democrat" is a noun, arguing that its use as an adjective defies the rules of English grammar:
http://mediamatters.org/research/200608160005
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