Mississippi Gov. Haley Barbour has announced he will not run for president, saying he doesn’t think he has the “fire in the belly.” It’s a decision that will have key implications for rest of the Republican primary field.

 As a potential candidate, Barbour brought with him great upside – he brought governing experience, policy chops, an unrivaled rolodex and fundraising operation. Yet he also had great vulnerabilities as a former lobbyist and white guy from the deep south.