Specter's Switch

Sen. Arlen Specter (PA) switched parties today, officially becoming a democrat. He claims that this is a result of changes in his constituency, which has been moving steadily democratic. Skeptics point to conservative challenges looming in the primary. In either case, this just goes to show how little difference there is between the parties. The Republicans are just Democrat Lites. Making a switch requires only a subtle difference. If only there was a viable third party...