That's the attribution the Washington Post offered up for a scoop they got on Romney's tenure leading Massachusetts. Not exaggerating. From the Post's story (emphasis added):
Mitt Romney was firm and direct with the abortion rights advocates sitting in his office nine years ago, assuring the group that if elected Massachusetts governor, he would protect the state’s abortion laws.
He would be a “good voice in the party” for their cause, and his moderation on the issue would be “widely written about,” he said, according to detailed notes taken by an officer of the group, NARAL Pro-Choice Massachusetts.
“You need someone like me in Washington,” several participants recalled Romney saying that day in September 2002, an apparent reference to his future ambitions.
Romney made similar assurances to activists for gay rights and the environment, according to people familiar with the discussions, both as a candidate for governor and then in the early days of his term.
There's plenty of evidence that Romney was far more liberal in the past than he says he is now. Check YouTube. And yet here's a story that stops just short of picking up a scribbled-on napkin at Tom's Diner as source material.
Look, I found my own scoop: