Our politics seem so poisoned today one is tempted to retreat to a soundproof room and either scream till the voice is no more or crank up the volume on some punk rock anthem until the hearing goes. We live in an era when every garden-variety disagreement begets threats of filibuster and terminal gridlock, and we are left longing for a more innocent and collegial time. Like…1968, maybe? No, that probably wouldn’t work. Two assassinations, two months apart, of towering figures in the civil rights movement coupled with an unpopular war to lend an unreal air to domestic politics that…