What would that mean to the electoral demographics in a generation or so?
The Wall Street Journal had an article, that because the 2000 election was as close as it was, the Democrats (Gore) would have won if abortion would have been illegal -- about 40 million more Americans.
This is mainly because abortion takes out more liberal voters than conservative ones. I just can't remember the date of the Wall Street Journal article, but it was before Peggy Noonan took a leave of absence from the Wall Street Journal.
Families tend to be Republican. For example, married men and married women are more likely to be Republican that are singles. I think that it may be a case of people who have families learning, real fast, what life is really about. Married people must take reponsibility, and a large proportion begin to get the knack of it. There is an old saying that goes something to the effect that everyone is a conservative in his own line of work (implying that when you face practical problems, you better be realistic). It is the same with maintaining a family: for most people without unlimited funds, practical lessons are learned very quickly, and even liberals may grow into conservatives.