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Hillary Clinton actually clinched the Democratic nomination before yesterday's primaries, on a day when no one voted, and no ballots were cast. It was seen as a fitting end for a primary process that many — from Bernie Sanders supporters to Donald Trump — say is rigged.

Senator Sanders himself didn't go quite that far in an interview last week. "I think it's just a dumb process, which has certainly disadvantaged our campaign," he said. 

But that process is actually up to change in late July with the Democratic National Convention, where Clinton and Sanders delegates will meet not just to nominate a candidate, but also to debate reforms for the future of the party.

Is the presidential nomination process rigged to favor long-time party loyalists? And is it exploiting the core of the Democratic system? For answers, we turn to Jennifer Lawless, a professor of government at American University.