Today, five U.S. states are holding primaries: Florida, Illinois, Missouri, North Carolina, and Ohio. For Republicans, Donald Trump and Ted Cruz are the candidates to beat, with 469 and 369 pledged delegates respectively.
A GOP candidate must secure 1,237 delegates in order to secure the nomination, but what happens if they don't? This video from Mashable breaks down the convention process, including what some Republicans are hoping will happen: a contested convention.
Members of the GOP establishment are counting on this in order for "anyone but Trump" to be the party's nominee. During a contested convention, there is another ballot round of voting among the delegates. After that, if no one has secured those 1,237 delegates (out of 2,472), the process repeats (rather complexly) and becomes a "brokered convention."
Republican party elites are in favor of the brokered convention, believing Trump will have no chance in the general election. There's speculation that this could open up the nomination for someone like Ohio Gov. John Kasich or Florida Senator Marco Rubio. The last time there was a brokered Republican convention was 1948, when Thomas Dewey defeated Robert Taft after three rounds.
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