I have seen a calendar (Workman Publishing Co., New York) which defined it as  personal magnetism and charm,  and said,  Given today's extensive TV coverage, political candidates need duende if they hope to be accepted by the public. 
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(ROOT (S (NP (PRP I)) (VP (VBP have) (VP (VBN seen) (NP (NP (DT a) (NN calendar)) (PRN (-LRB- -LRB-) (NP (NP (NNP Workman) (NNP Publishing) (NNP Co.)) (, ,) (NP (NNP New) (NNP York))) (-RRB- -RRB-)) (SBAR (WHNP (WDT which)) (S (VP (VP (VBD defined) (NP (PRP it)) (PP (IN as) (NP (JJ personal) (NN magnetism) (CC and) (NN charm)))) (, ,) (CC and) (VP (VBD said) (SBAR (S (, ,) (PP (VBN Given) (NP (NP (NN today) (POS 's)) (JJ extensive) (NN TV) (NN coverage))) (, ,) (NP (JJ political) (NNS candidates)) (VP (MD need) (VP (VB duende) (SBAR (IN if) (S (NP (PRP they)) (VP (VBP hope) (S (VP (TO to) (VP (VB be) (VP (VBN accepted) (PP (IN by) (NP (DT the) (NN public))))))))))))))))))))) (. .)))
There has been at least one calendar which defined it as personal magnetism and charm.
( There ( ( has ( been ( ( ( ( at least ) one ) calendar ) ( which ( ( defined it ) ( as ( personal ( ( magnetism and ) charm ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ has) (VP (VBN been) (NP (NP (QP (IN at) (JJS least) (CD one)) (NN calendar)) (SBAR (WHNP (WDT which)) (S (VP (VBD defined) (NP (PRP it)) (PP (IN as) (NP (JJ personal) (NN magnetism) (CC and) (NN charm))))))))) (. .)))