1. A computer readable storage medium storing a program of instructions executable by a machine to perform a method of diffusing evidence among candidate answers during question answering, comprising: identifying, by a processor, a relationship between a first candidate answer and a second candidate answer, wherein the candidate answers are generated by a question-answering computer process, the candidate answers have associated supporting evidence, and the candidate answers have associated confidence scores; transferring all or some of the evidence from the first candidate answer to the second candidate answer based on the identified relationship; and computing a new confidence score for the second candidate answer based on the transferred evidence.