In a letter released today, Tides CEO and founder Drummond Pike called on advertisers to stop supporting Fox News.

Pike wrote that Byron Williams -- the alleged gunman who, according to police, said he planned to murder employees of Tides and the ACLU -- relied heavily on conspiracy theories advanced on Glenn Beck's show:

The advertising boycott of Glenn Beck has cost the controversial host over half of his estimated advertising revenue since it was launched by ColorOfChange.org a month ago. This according to data analyzed from industry sources.

Estimated advertising revenue [the total amount of advertising money being spent during a block of commercial time for a program] was collected on a week-by-week basis for a period of two months. According to the data collected, the amount of money spent by national advertisers on Beck’s program per week was at its highest at approximately $1,060,000, for the week ending August 2, 2009. ColorOfChange.org launched their campaign at the end of that week and since then, 62 advertisers have distanced themselves from Beck. Data collected for the week ending September 6, 2009 shows Beck’s estimated ad revenue at $492,000, equal to a loss of $568,000.