From a story that came out today in the New Republic:
"The Enquirer really tries to get it right," says David Kendall, an attorney who for 20 years served as the Enquirer's legal counsel and who famously defended Bill Clinton during the Monica Lewinsky scandal. "It's subject to the same libel laws everybody else is."
http://tnr.com/politics/story.html?id=3dd2eae0-d280-4993-abd4-d61795adf50f