I just wanted to add a few things to the discussion. If you are debating homosexuality and abortion in the context of religion, it is different than if you are debating domestic policy. The Bible says that homosexuality is a sin(1 Corinthians 6:9). That does not mean that it should be outlawed or people should stone homosexuals. It does mean that homosexuals should not be clergy, or even members of the church. Christians are still called to love them, but there is a difference between loving a person and accepting that person's sin.
As for abortion, it is not discussed in the Bible because they never thought of it as an issue then. However, the Bible does try to indicate where life begins. In Psalm 51:5, David states, "Surely I was sinful at birth, sinful from the time my mother concieved me." and in Luke 1, Mary, pregnant with Jesus, visits her cousin Elizabeth, pregnant with John, and John leaps for joy in Elizabeth's stomach. You have to be alive in order to sin or be joyful.