…the days of Glenn Beck drawing three million viewers are long gone. And they’re never coming back. But at this rate, the two-million viewership mark seems to be slipping away, too. Glenn Beck now routinely flirts with ratings in the 1.6-1.8 million range, which is almost exactly half the rating Beck was getting one year ago. In truth, that’s how many viewers Glenn Beck used to attract when the host was on vacation and somebody less famous stood in for him…