abogar por

(v.) = argue + in favour of, plead for, champion
Ex: Despite the present financial straits of developing countries, she argues in favour of long-term plan for the acquisition of relevant rare book material. Ex: I would plead for more standardization, not less, because I think whatever we do is going to be imperfect. Ex: In particular he championed free photoduplication of library materials as a natural extension of library services to patrons at a distance.