Far from hard to imagine. In the 1950's in Connecticut, it was Prescott Bush running as the candidate of Planned Parenthood, and Nelson Rockefeller was the New York Governor to push for abortion legalization in, what, 1970? In 1976, while Carter was obviously pro-choice, he had a certain benefit from running against a pro-choice, Yankee, Washington insider. To my knowledge, Republicans on the East Coast were early-ish supporters of abortion for reasons related to immigrant populations. It's not hard to imagine a modern-day Wall Street, bourgeois party that eschews "troglodytic" beliefs like a large welfare state or abortion restrictions. What RINO Tom refers to as "natural" is not in the conservative sense--my perspective, anyway--but in the sense of the GOP now representing the zenith of liberalism: atomization of the populace, triumph of individualism, secularization, and so on.
As much as it would pain me to separate from GOP icons like Nixon, it's relatively easy to see myself as a Democrat in this version of events.
In a scenario like this, I'd be independent or still GOP. There would still be a pro-life faction in the party led by folks like Ron/Rand Paul.
