Tough Week for The Post and a Star By Deborah Howell Sunday, November 20, 2005; B06 The Post took a hit to its credibility with readers last week when Bob Woodward revealed that he had been told about the identity of CIA analyst Valerie Plame more than two years ago but had kept it to himself for fear of being subpoenaed. Readers in droves wrote that they were angry and disappointed. That disappointment was rife in The Post's newsroom, too. Since Woodward and Carl Bernstein broke the Watergate story more than 30 years ago, they have been heroes to many....