linkWASHINGTON-In the continuing controversy surrounding the president's U.S. citizenship, a new fringe group informally known as "Afterbirthers" demanded Monday the authentication of Barack Obama's placenta from his time inside his mother's womb. "All we are asking is that the president produce a sample of his fetal membranes and vessels-preferably along with a photo of the crowning and delivery-and this will all be over," said former presidential candidate and Afterbirthers spokesman Alan Keyes, later adding that his organization would be willing to settle for a half-liter of maternal cord plasma. "To this day, the American people have not seen a cervical mucus plug, let alone one that has been signed and notarized by a state-certified Hawaiian health official. If the president was indeed born in the manner in which he claims, then where is his gestation sac?" Keyes said that if Obama did not soon produce at least a bloody bedsheet from his conception, Afterbirthers would push forward with efforts to exhume the president's deceased mother and inspect the corpse's pelvic bone and birth canal.