What's an open convention, and how could that play into Kamala Harris' vie for the presidency?

AUSTIN (KXAN) — With President Joe Biden announcing the suspension of his re-election campaign Sunday and throwing support behind Vice President Kamala Harris, the vice presidential-turned-presidential candidate now needs to gather support from Democratic delegates to formally cinch the nomination at the Democratic National Convention (DNC) in August.

The DNC kicks off on Aug. 19 in Chicago. Under existing party rulings, the winning Democratic candidate to claim the nomination must receive support from 1,976 delegates ...