One unfortunate reality of modern politics is the right-left mutually reinforcing media echo chamber. The most extreme voices on either side broadcast the most outrageous statements of the other side as a way to define their opposition and attract attention to themselves. This is the way to understand the flurry of fever-swamp chatter about impeaching President Obama.

Sarah Palin joined the impeachment calls on Tuesday, which could mean that the former Alaska Governor has been feeling neglected. She is following the talk radio...