About this series: Presidential traits

Make or Break series: Presidential candidates are a breed apart, often propelled by traits that have shaped their careers and have deep roots in their personal histories. In the coming weeks, The Washington Post will explore a key trait of each of the leading contenders that could help make him or her the country's next commander in chief — or sink their presidential ambitions.

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Moved earlier:

TRAIT-PERRY (June 5)

TRAIT-HUCKABEE (May 6)

TRAIT-RUBIO (April 14)

TRAIT-PAUL (April 9)