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<http://webisa.webdatacommons.org/316346728>	<http://www.w3.org/ns/prov#value>	"Santorum has also criticized the public education system and prestigious universities such as Harvard -- institutions that he called indoctrination centers for the left, according to David Halperin, a senior fellow at United Republic, a nonprofit group that aims to counter the influence of well-heeled special interest groups in politics." .