Listen to the man’s words:
http://www.youtube.com/watch?v=7OQoBxZZPqU&feature=player_embedded
He advocated that abortion should be safe and legal in this country from the time that his mother ran for office way back in 1970 (before Roe v Wade even). Definitely not a popular idea.
The exact boast is at the 51 second mark in the above video.
And, yes, he was boasting about being an abortionist since at least 1970.