Need references: McCain's abortion flip-flops

To demonstrate that he was for Roe v Wade before he was against it.

There's a perception that Democrats think having an abortion's no different than popping a pimple. And when some otherwise rational people hear, or told, that Obama made a rather sensible observation (getting them to admit that a Democrat can do that can be quite a chore :) ), namely that regardless of one's position on abortion, a personal, moral issue, we can (or should) agree that we need to reduce teenage pregnancy, the response is a cynical, sure, he means to just hand out condoms.

I think abortion is a red herring, and would like to start reframing the issue. One place to begin, I think, is to show that it's a flip-flop issue.

Anyway, sources are needed. Thanks in advance to the good DU folk. You always come through.