[deport]

The way the primaries are front loaded,

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Here is a preliminary Primary Schedule which gives 13 states and 5 state caucuses
by the end of the first week in March.

Preliminary 2016 Presidential Primary Schedule

[TomGuy]

Southern states are requesting that the RNC allow them to hold their primaries in early March.

Many of them are currently scheduled for May or June. By then, the nominee will probably have already been determined weeks earlier, as in 2008 and 2012.