Alan Keyes (pictured) lost to Barack Obama in the U.S. Senate race in Illinois in 2004.

Now Keyes has now come back to haunt his former opponent over questions regarding Obama's citizenship.

Keyes and other members of the American Independent party have filed suit in California Superior Court in Sacramento to stop the state from giving its electoral votes to President-elect Barack Obama until documentary evidence is provided to prove Obama is indeed a citizen of the United States.

Some conservatives have questioned Obama's citizenship in recent months. Obama says he was born in Hawaii in 1961.

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