In the VP debates Joe Biden said he personally opposes abortion. However he said he respects the position of those who favor abortion and doesn't want to impose his beliefs on others. All legislation imposes beliefs on many who disagree with it.
I would guess Joe opposes rape (and wife beating). Is he not going to impose his beliefs on anyone who wants to commit rape (or wife beating etc).
Joe, abortion eliminates a human being. Justin Bieber's mother was alone and pregnant at 18. She considered abortion and suicide. Fortunately she found a pregnancy crisis center and carried her child to term. How close we came to not having her child's talent.
Life is the ultimate value.
Dust thou Art and unto dust thou shalt return.