Many people, constituents who request help and especially the officials' staff, treat incumbents with deference bordering on obsequiousness. A consequent loss of humility can destroy a politicians base. Excessive collegiality is a trap for incumbents who really want to accomplish things. Not helping to nominate and elect allies in their home states and elsewhere. A well-run team takes care of its' own.
Serious politicians work hard to elect others who share their public policy agendas.