Six reasons so many Republicans are running for president

The Republican presidential field could wind up with close to 20 candidates. Here's our list of reasons why.

2. No incumbent on the ballot

Ross D. Franklin/AP
Former Florida Gov. Jeb Bush speaks at the Republican National Committee spring meeting in Scottsdale, Ariz., May 14, 2015.

President Obama will finish his second term in January 2017, and is ineligible to run again. Open-seat presidential races generally attract a large field, when there’s no obvious successor lining up to run. But that factor alone doesn’t explain the particularly large GOP field. 

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