Just last fall, as the networks exploded with coverage of Mark Foley's creepy instant messaging, we noted the networks (like ABC) had a very different way of covering Republican sex scandals -- especially the gay-themed ones -- than they did for Democrats. The best example is Barney Frank.
Notice how the networks define hypocrisy, and how liberals never seem to qualify. Frank was a lawmaker with a male-prostitution ring in his house, not to mention a lawmaker who kept getting the pimp's parking tickets waved off. Notice how they all mention "the voters" will decide, instead of going searching for legislators and party activists to underline his need to resign.
The people who manufacture the news in America are very persistent at writing the narrative exactly as it helps liberalism emerge victorious. On ethical scandals, they're very good at making sure Republicans force theirs to resign, and they're also very good at keeping Democrats shamelessly in power.