A book signing for conservative commentator Ben Shapiro was postponed on Wednesday by the Ronald Reagan Presidential Library in Simi Valley, California, after fellow right-wing activist Charlie Kirk was fatally shot at an event at Utah Valley University around noon local time. "The Ronald Reagan Presidential Foundation and Institute is saddened to hear of events that took place today at Utah Valley University," the library said in a statement. "Our prayers are with Charlie Kirk and his family. As a mark of respect, we are cancelling our program and book signing with Ben Shapiro this evening. A new date will...