When Harry Truman and Lyndon Johnson accepted the reality that they could not effectively govern the nation if they sought re-election to the White House, both men took the moral high ground and decided against running for a new term as president. President Obama is facing a similar reality—and he must reach the same conclusion.

He should abandon his candidacy for re-election in favor of a clear alternative, one capable not only of saving the Democratic Party, but more important, of governing effectively and in a way that preserves the most important of the president’s accomplishments. He should step aside for the one candidate who would become, by acclamation, the nominee of the Democratic Party: Secretary of State Hillary Clinton.

Never before has there been such an obvious potential successor—one who has been a loyal and effective member of the president’s administration, who has the stature to take on the office, and who is the only leader capable of uniting the country around a bipartisan economic and foreign policy.

Certainly, Mr. Obama could still win re-election in 2012. Even with his all-time low job approval ratings (and even worse ratings on handling the economy) the president could eke out a victory in November. But the kind of campaign required for the president’s political survival would make it almost impossible for him to govern—not only during the campaign, but throughout a second term.

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