Retailing giant Wal-Mart and seven other companies pulled their ads from his show, organizers said.
Among those bailing on Beck: GMAC Financial Services, Best Buy, CVS and Travelocity.
A total of 20 companies have pulled their ads in the last two weeks, Color of Change says, including Geico, ConAgra, RadioShack, Men's Wearhouse, State Farm, Sargento and Procter & Gamble.
Judging from Monday night's broadcast, there were plenty of companies eager to fill the ad slots, including The Wall Street Journal, DirecTV, Honda and Oprah Winfrey's Oxygen Channel.