NEW YORK—There were charges of racism, sexism and disrespect. There were hurt feelings and angry outbursts. Friendships were frayed and tens of millions of dollars were spent.

But the great Obama-Clinton war of 2008 appeared to be little more than a distant memory on Monday when President Barack Obama and former President Bill Clinton took the stage to raise big money for Obama’s re-election campaign.

It’s a Washington ritual—burying the hatchet. And it has rarely been practiced so publicly. Four years after the primary that divided the Democratic Party, Hillary Rodham Clinton is the face of the Obama’s foreign policy and Bill Clinton has become a frequent and reliable political ally.