9. A system for diffusing evidence among candidate answers during question answering, comprising: a processor; and an evidence diffusion module operable to identify a relationship between a first candidate answer and a second candidate answer, wherein the candidate answers are generated by a question-answering computer process for answering a question, the candidate answers have associated supporting evidence, and the candidate answers have associated confidence scores, the evidence diffusion module further operable to transfer all or some of the evidence associated with the first candidate answer from the first candidate answer to the second candidate answer based on the identified relationship, the evidence diffusion module further operable to compute a new confidence score for the second candidate answer based on the transferred evidence and an existing evidence associated with the first candidate answer, wherein the first candidate answer and the second candidate answers have evidence feature attributes of at least passage-text-evidence and transferred-passage-text evidence, and wherein the evidence associated with the first candidate answer is transferred at least from the passage-text-evidence feature attribute of the first candidate answer to the transferred-passage-text evidence feature attribute of the second candidate answer.
9. A system for diffusing evidence among candidate answers during question answering, comprising: a processor; and an evidence diffusion module operable to identify a relationship between a first candidate answer and a second candidate answer, wherein the candidate answers are generated by a question-answering computer process for answering a question, the candidate answers have associated supporting evidence, and the candidate answers have associated confidence scores, the evidence diffusion module further operable to transfer all or some of the evidence associated with the first candidate answer from the first candidate answer to the second candidate answer based on the identified relationship, the evidence diffusion module further operable to compute a new confidence score for the second candidate answer based on the transferred evidence and an existing evidence associated with the first candidate answer, wherein the first candidate answer and the second candidate answers have evidence feature attributes of at least passage-text-evidence and transferred-passage-text evidence, and wherein the evidence associated with the first candidate answer is transferred at least from the passage-text-evidence feature attribute of the first candidate answer to the transferred-passage-text evidence feature attribute of the second candidate answer. 13. The system of claim 9 , wherein the evidence diffusion module transfers evidence by transferring feature scores across candidates.