NEW YORK (AP) — In a story published Dec. 11, 2014, The Associated Press reported that researchers from Columbia University and the University of California-Los Angeles had found that openly gay canvassers were far more effective than straight canvassers in shifting voters' views toward support for same-sex marriage. On Tuesday, Columbia Professor Donald Green asked that Science magazine retract the study; Green said when their conclusions were challenged, he and his co-author Michael LaCour were unable to produce their raw data, which he said had been accidentally deleted.
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