[Teacher317]

We have more than a year to go before the real run-up begins. Even if 20 enter, few will survive when they fail to top 2 percent in any poll, ever.

[Lisbon1940]

Easier, just eliminate the full-term governors and it gets down to a manageable size.

[deport]

We have more than a year to go before the real run-up begins

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You may want to look at the schedule. By this time in 2016 we’ll likely know the winner.
There will be some 25 primaries and several caucuses by the end of April.

Tenative schedule :

http://www.uspresidentialelectionnews.com/2016-presidential-primary-schedule-calendar/

Tenative debate schedule:

http://www.uspresidentialelectionnews.com/2016-debate-schedule/2016-republican-primary-debate-schedule/