Political blogs preach to the choir

For the life of me I don't understand the appeal of political blogs. A bunch of people who profess to be of more or less one mind about issues posting and commenting from pretty much the same perspective is at best boring. Don't these people know what they think? Are their convictions so weak they need others with little or no imagination to edify them? It's a strange phenomena, but one that is apparently a big part of a lot of folk's human condition. It's pitiful. It's pitiful that these same (type of) people dominate the political debate in the US. The liberals and conservatives are the problem. By their participation they perpetuate a political system that is completely corrupt. The are the corporation's useful idiots. Unfortunately they'll pull all of us down with them as they continue sinking the ship of state.