Ms. Coulter is nearly 100% accurate in her columnal claims, as she was today and as she is in her books, but in her books she cites (and usually references) her sources. She claims that differential is due to editorially-imposed spatial limits on her texts, though many other columnists are unwilling to sacrifice their referential credibility on the altar of preference for two twenty extra words of sarcastic wit. To each their own.
Readers interested in confirming Ms. Coulter's claims are invited again to visit Another Slow News Day's blog page devoted to the subject of Government Employment.
Everyone else can wait until she cites her sources in her next book.