We The People Foundation headed by anti-tax activist Robert L. Schulz of New York has placed ads in the Monday and Wednesday editions of the paper that raise questions about the authenticity of Obama's Hawaiian birth certificate, the Tribune reports.

Hawaiian officials say Obama's birth certificate is locked in a state vault and have vouched for its authenticity. Schulz's group contends Obama may have been born in Kenya.

Cases challenging the president elect's citizenship have already been tossed out of courts in several states.

Schulz has told the Tribune his concern about Obama's citizenship is not partisan.

"We never get involved in politics," he said of his organization.

Schulz said he chose the Tribune for his ads after considering USA Today which charged a lot more.