I have found that attitudes on abortion, for guys anyway, are often formed on the basis of whether they like children or not and let's face it, children aren't very popular in today's western values culture. Really, how many young guys today dream of getting married and having a family ? Quite few in my parts.
Another thing that I have found interesting is that, I have friends that were staunchly pro abortion at any cost, some ten years ago, however today, they're married and have a kid or two and wouldn't you know it, they're kinda centered or actually leaning pro life.
One more thing to take note of - When you hear of somebody on the pro life side of the equation, this doesn't necessarily mean that they would vote accordingly to suspend a woman's right to choose, they'd just rather see individuals take better responsibility so that pregnancy terminations are held to a minimum.
~Just sayin~