Remember the 'Flush Rush' boycott attempted by David Brock and Media Matters which called for advertisers to drop their sponsorships of Rush Limbaugh's radio show? How did that work out in the long run? According to liberal radio talk host Thom Hartmann on CNN's Reliable Sources yesterday it completely backfired because it ended up hurting liberal shows: David Brock and Media Matters were leading the boycott Limbaugh crusade, which did presumably some damage to the Limbaugh show. I can tell you it did a lot of damage to progressive talk radio, because a lot of advertisers right across the board...