Can you clarify this?
The main teacher of the Catholic faith in every diocese is the Catholic bishop: he is the one with the chief role of "Teach, Govern, Sanctify." Everyone has a share in this by their Baptism, but the bishop is the head guy as far as the Diocese goes.
So in that sense, the local church is defined as "the people of God in union with their bishop," and yes, the bishop speaks for the Church.
Having said that, the bishop's authority pertains only in union with the Pope, only in accord with Canon Law, and only in matters of faith and morals (plus ecclesial governance and discipline in his own diocese: the ordination and assignment of clergy, good order in the church, i.e. the correct conduct of the Liturgy and the Sacraments, etc.)
It does not extend to prudential secular judgment, e.g. political parties and candidates, movie reviews, better homes and gardens, foreign and military policy, business, sports, the weather, entertainment, the etc. etc. --- That's the sphere of the laity, and it's not the bishop's "job" (except inasmuch as it has salient moral content, i.e. those matters which are required by God, or forbidden by Him).
In secular, prudential judgments, the bishop does not represent the Church and does not speak for the Church. He has a right to his own opinion, like anyone with a brain; his own dollar, like anyone in the market; his own vote, like any citizen.
Does that cover it? Or did I misconstrue the question :o)