We write in sadness as traditional liberal Democrats who believe in inclusion. Like many Americans, we had hoped that Obama would maintain the spirit in which he campaigned. Instead, since taking office, he has pitted group against group for short-term political gain that is exacerbating the divisions in our country and weakening our national identity.The culture of attack politics and demonization risks compromising our ability to address our most important issues – and the stature of our nation’s highest office.

Indeed, Obama is conducting himself in a way alarmingly reminiscent of Nixon’s role in the disastrous 1970 midterm campaign. No president has been so persistently personal in his attacks as Obama throughout the fall. He has regularly attacked his predecessor, the House minority leader and – directly from the stump – candidates running for offices below his own. He has criticized the American people suggesting that they are “reacting just to fear” and faulted his own base for “sitting on their hands complaining.”…

We are also disturbed that the office of the president is mounting attacks on private individuals, such as the founders of the group Americans for Prosperity. Having been forged politically during Watergate – one of us was the youngest member of Nixon’s enemies list – we are chilled by the prospect of any U.S. president willing to marshal the power of his office against a private citizen.

The president is the leader of our society. That office is supposed to be a unifying force. When a president opts for polarization, it is not only bad politics, but it also diminishes the prestige of his office and damages our social consensus.