A Primer on Primaries
![](https://media.wnyc.org/i/800/0/c/85/2020/02/AP_20036646894576.jpg)
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., bottom right, addresses an audience at the Derry Opera House during a campaign rally
( Steven Senne / AP Images )
( Steven Senne / AP Images )
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