For decades, the pollsters at Gallup have been asking Americans if they trust their media. In 1974, the year Woodward and Bernstein brought an end to Richard Nixon’s presidency , 69 percent of them did. In a poll released last year, that number was at a historic low. Today, the only institutions Americans have less faith in than television news (21 percent) and newspapers (20 percent) are Congress and “big business.” That’s pretty damn low — humiliatingly low, especially for a group of people who fancy themselves members of “the Fourth Estate.”