From the EWTN page.
PATRON OF THE CHURCH
Saint Joseph, God has appointed you patron of the Catholic Church because you were the head of the Holy Family, the starting-point of the Church. You were the father, protector, guide and support of the Holy Family. For that reason you belong in a particular way to the Church, which was the purpose of the Holy Family's existence.
I believe that the Church is the family of God on earth. Its government is represented in priestly authority which consists above all in its power over the true Body of Christ, really present in the Blessed Sacrament of the Altar, thus continuing Christ's life in the Church. From this power, too, comes authority over the Mystical Body of Christ, the members of the Church -- the power to teach and govern souls, to reconcile them with God, to bless them, and to pray for them.
You have a special relationship to the priesthood because you possessed a wonderful power over our Savior Himself. Your life and office were of a priestly function and are especially connected with the Blessed Sacrament. To some extent you were the means of bringing the Redeemer to us -- as it is the priest's function to bring Him to us in the Mass -- for you reared Jesus, supported, nourished, protected and sheltered Him. You were prefigured by the patriarch Joseph, who kept supplies of wheat for his people. But how much greater than he were you! Joseph of old gave the Egyptians mere bread for their bodies. You nourished, and with the most tender care, preserved for the Church Him who is the Bread of Heaven and who gives eternal life in Holy Communion.
God has appointed you patron of the Church because the glorious title of patriarch also falls by special right to you. The patriarchs were the heads of families of the Chosen People, and theirs was the honor to prepare for the Savior's incarnation. You belonged to this line of patriarchs, for you were one of the last descendants of the family of David and one of the nearest forebears of Christ according to the flesh. As husband of Mary, the Mother of God, and as the foster-father of the Savior, you were directly connected with Christ. Your vocation was especially concerned with the Person of Jesus; your entire activity centered about Him. You are, therefore, the closing of the Old Testament and the beginning of the New, which took its rise with the Holy Family of Nazareth. Because the New Testament surpasses the Old in every respect, you are the patriarch of patriarchs, the most venerable, exalted, and amiable of all the patriarchs.
Through Mary, the Church received Christ, and therefore the Church is indebted to her. But the Church owes her debt of gratitude and veneration to you also, for you were the chosen one who enabled Christ to enter into the world according to the laws of order and fitness. It was by you that the patriarchs and the prophets and the faithful reaped the fruit of God's promise. Alone among them all, you saw with your own eyes and possessed the Redeemer promised to the rest of men.
Saint Joseph, I thank God for your privilege of being the Patron of the Church. As a token of your own gratitude to God, obtain for me the grace to live always as a worthy member of this Church, so that through it I may save my soul. Bless the priests, the religious, and the laity of the Catholic Church, that they may ever grow in God's love and faithfulness in His service. Protect the Church from the evils of our day and from the persecution of her enemies. Through your powerful intercession may the church successfully accomplish its mission in this world -- the glory of God and the salvation of souls!
Saint Joseph, I, your unworthy child, greet you. You are the faithful protector and intercessor of all who love and venerate you. You know that I have special confidence in you and that, after Jesus and Mary, I place all my hope of salvation in you, for you are especially powerful with God and will never abandon your faithful servants. Therefore I humbly invoke you and commend myself, with all who are dear to me and all that belong to me, to your intercession. I beg of you, by your love for Jesus and Mary, not to abandon me during life and to assist me at the hour of my death.
Glorious Saint Joseph, spouse of the Immaculate Virgin, obtain for me a pure, humble, charitable mind, and perfect resignation to the divine Will. Be my guide, my father, and my model through life that I may merit to die as you did in the arms of Jesus and Mary.
Loving Saint Joseph, faithful follower of Jesus Christ, I raise my heart to you to implore your powerful intercession in obtaining from the Divine Heart of Jesus all the graces necessary for my spiritual and temporal welfare, particularly the grace of a happy death, and the special grace I now implore:
That the leaders of the Church deal with the Legion of Christ and Regnum Christi in Wisdom, Mercy, Justice and Love.
That all those who currently work for the Legion may find new ways to support their families.
That families injured through their experiences with the Legion and Regnum Christi may find healing and peace.
And for Benedict, our pope, that he receives all the graces he needs to lead the Church through this crisis.
Guardian of the Word Incarnate, I feel confident that your prayers in my behalf will be graciously heard before the throne of God. Amen.
Remember, most pure spouse of Mary, ever Virgin, my loving protector, Saint Joseph, that no one ever had recourse to your protection or asked for your aid without obtaining relief. Confiding, therefore, in your goodness, I come before you and humbly implore you. Despise not my petitions, foster-father of the Redeemer, but graciously receive them. Amen.