March 18, 2020: Joe Biden wins primaries in Arizona, Florida, and Illinois. Donald Trump crosses the delegate threshold to secure the Republican nomination. Maryland moves its primary from April 28 to June 2. ![blank](http://go.pardot.com/images/addthis/16x16/blank-block.png)
Ballotpedia is monitoring changes made to election dates and procedures in response to the coronavirus pandemic.
Here are the presidential primary updates you need to know:
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