| http://www.w3.org/ns/prov#value | - Calvert is a frequent commentator in the national press, having been quoted The New York Times, Los Angeles Times, Boston Globe, and USA Today and having authored or co-authored several dozen op-ed commentaries published in newspapers such as the Chicago Tribune, Sacramento Bee, San Francisco Chronicle, St. Louis Post-Dispatch, Philadelphia Inquirer, Pittsburgh Post-Gazette and Christian Science M
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