NPR's CEO and president, Vivian Schiller, has been forced to resign, the radio broadcaster's media correspondent said Wednesday, following an undercover sting in which a senior executive was videotaped describing Tea Party members as "racist." On Tuesday, Schiller had condemned the comments by Ron Schiller (no relation) — NPR Foundation's senior vice president for fundraising at the time — that were secretly filmed by political activist James O'Keefe of "Project Veritas." But a Wednesday statement from the chairman of NPR's board of directors, Dave Edwards, said the board had accepted Vivian Schiller's resignation "with deep regret." It was effective immediately......