What is a "culture of life"?

In President Bush's phone call to the "March for Life" participants, he said:

• I appreciate so very much your work toward building a culture of life-- (applause) -- a culture that will protect the most innocent among us and the voiceless. We are working to promote a culture of life, to promote compassion for women and their unborn babies.

Apparently Bush thinks nominating a man for Attorney General who considers Roe v Wade to be settled law and the reelection of Arlen Specter to be critical in his efforts at building the "culture of life".