Kamala Harris and Barack Obama in 2012Paul Chinn/San Francisco Chronicle/AP

When Barack Obama takes the stage in Chicago tonight to support the candidacy of his old friend Kamala Harris, many Americans will see it as another torch-passing moment in a Democratic National Convention that’s already been replete with them. This one is extra emotional because of the sheer improbable nature of what the former president and current vice president have achieved. What many people won’t realize is that without Harris’s early and enthusiastic support, Obama’s career might have taken a different trajectory. Maybe he would have ended up in the White House anyway in 2008, maybe later, but Harris gave him a critical boost at a time when he was still largely unknown. And she did it at enormous risk to her own standing with the Democratic Party’s donor class.

In 2007, the vast majority of those donors were Team Hillary. Harris became one of the first elected California politicians to endorse Obama. Many of her Democrat-elite pals were miffed.

Back in 2007, Harris was a rising star in Bay Area politics, a “progressive prosecutor”........

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