In 2016, the primaries changed the rules and required proportional representation until mid-March when states could choose to allocate all their delegates to the outright winner (seven states did so) or to anyone who scored over 50 percent of the state and congressional districts.

Republican Party (GOP)                    

Explanation:

In 2016, the GOP primaries changed the rules and required proportional representation until mid-March when states could choose to allocate all their delegates to the outright winner (seven states did so) or to anyone who scored over 50 percent of the state and congressional districts.

The GOP 2016 primary calendar stipulates that for the first two weeks of March states are to allocate their delegates proportionally until mid March when available delegates will be awarded to the outright winner thus giving room for multiple candidates to compete deep into the race. This was necessary to prevent an over drawn nomination fight as was experienced in 2012.

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