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Cajole
Often Positive
Using 'cajole' suggests a friendly, gentle method of persuasion, unlike 'manipulate' which is more negative. 
Non-Forceful
'Cajole' implies persuasion without force or intimidation, but through pleasant means. 
Subtly Persistent
'Cajole' entails a level of persistence; the speaker often has to sweet-talk persistently to convince. 