This week’s Mainstream Media Scream gets a little queasy at CNN Newsroom anchor Carol Costello’s sneer at conservative radio host Rush Limbaugh for writing a children’s history book that features “Rush Revere.”

Costello expressed her disgust over Limbaugh's upcoming children's book, "Rush Revere and The Brave Pilgrims,” via Twitter last week. Costello first snarked: "Um. Oh. Seriously?" Minutes later, the on-air personality tweeted, "I'm a little sick now."

Both were in reaction to tweets by HuffPost Media.

And she didn’t back down when criticized. A TV Newser story Friday was headlined: “CNN Anchor Stands By Tweet Critical of Rush Limbaugh Children’s Book.”

Media Research Center Vice President of Research Brent Baker explains our pick: “What is Costello so afraid of? That kids might learn to admire the founders and Revolutionary War heroes by reading a book by a man in touch with more Americans, judging by ratings, than anyone on CNN? CNN wants you to believe its anchors are moderates situated mid-way between FNC and MSNBC, but Costello shows she has just as much contempt for conservatives as anyone on MSNBC."

Rating: Four out of five screams.

Paul Bedard, The Washington Examiner's "Washington Secrets" columnist, can be contacted at