For the past two years, Herman Cain has written a weekly column for WorldNetDaily, a website that is the online hub for people who believe that President Barack Obama was not born in the United States.

Not one of Cain's 113 columns broaches the topic of Obama's birth. He has used his WorldNetDaily column to build support for his presidential candidacy, outline his policy ideas on health care and economics and clarify his positions on the campaign trail.

Cain, a Georgia businessman who is running for the Republican presidential nomination, has catapulted in recent polls into the field's top tier, following his victory last month at the Florida straw poll. His decision to associate himself with the birther movement's flagship publication could hinder his attempt to shift from a tea party star into a leading Republican presidential candidate.