From a May 29 WorldNetDaily article:

WND also used Fox Nation's post to fundraise for it's “Where's the birth certificate?” billboard campaign and promote its petition for the “PUBLIC RELEASE OF BARACK HUSSEIN OBAMA'S BIRTH CERTIFICATE.”

As Media Matters for America documented:

A May 28 headline on The Fox Nation -- Fox News' purportedly bias-free website -- asked: “Should Obama Release Birth Certificate? Or Is This Old News?” But contrary to The Fox Nation's question, the Obama campaign released a copy of President Obama's birth certificate, posting it on the campaign's Fight the Smears website. It also reportedly provided the original document to FactCheck.org, whose staff concluded in an August 21, 2008, post that it “meets all of the requirements from the State Department for proving U.S. citizenship.” The Hawaii Department of Health also repeatedly confirmed that the birth certificate on record with the state is valid and proves that he was born in the state of Hawaii.