According to Slate it has... but then it has lost "credibility"... I don't think so.
LIAR, LIAR
Liberal writers steal a rhetorical trick from the conservatives.
By Jack Shafer
...SNIP..
As television's conservative performers know, if liar-liar fails, your next fallback is to call your foe depraved, unpatriotic, or immoral. Wrapped between hard covers, these blustery allegations can become best-selling books: See Hannity's Let Freedom Ring, Savage's Savage Nation, Coulter's Slander, and also-rans by Mona Charen (Useful Idiots) and Tammy Bruce (The Death of Right and Wrong). Coulter's latest best seller, Treason, charts virgin rhetorical territory by accusing Democrats of assisting foreign enemies in overthrowing the United States.
...SNIP...
Liberal scriveners may improve their team's political lot by matching the conservative investment in liar-liar stock, but it will come at the expense of their credibility. I suppose that when consuming liar-liar books in pairs, say Sean Hannity's versus Joe Conason's, the average reader might come within spitting distance of political reality. But having read too many of these books for my own good, I've concluded that if you're interested in which wing lies more, you're probably not very interested in the truth.
http://slate.msn.com/id/2087591/