Day one of the Democratic convention was dominated by disgruntled Bernie Sanders supporters. The protested in the city; they chanted and booed inside the arena. And so even though 90 percent of Sanders voters now say they’re supporting Hillary Clinton, the Sanders vanguard was still fighting.

It’s instructive to compare what happened in Philadelphia yesterday with what happened at the Denver convention in 2008. The contrast illustrates that it didn’t have to be this way.

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