You are free to decide where and with whom you stand. You do not, however, have the right to try to change the Catholic Church to suit your opinions or wishes. No matter how brilliant you are, you are not above the Magisterium. No matter how persuasive the political position, you cannot ignore the law of the Church and the Natural Law. Doctrine and Orthodoxy may be distasteful words in this age of personal freedoms, but if you call yourself Catholic, you need to know what Catholic doctrine actually says and follow it.
The five non-negotiables for Catholic Voters: Abortion, Euthanasia, Embroyonic Stem Cell Research, Human Cloning, Homosexual Marriage.