Nate Silver (fivethirtyeight) on pro-choice Dems voting for Stupak

When I first learned that the Stupak Amendment, which would prevent abortion from being covered under health care plans included in the health care insurance exchanges, had passed by a 240-194 margin in the House, I assumed that something like the following happened: anybody who was either pro-life or who disapproved of the health care bill in general had voted for it.

Certainly, that description is apt for the half-dozen or so generally pro-choice Republicans, all of whom voted both for the Stupak Amendement and against the health care bill. But it doesn't really hold for the Democrats.

Rather, I was surprised at the number of Democrats who have solid pro-choice voting records but who nevertheless voted for Stupak Amendment. And the vast majority of these Democrats voted for, not against, passage of the underlying health care bill.

The below chart lists the 'yea' votes on Stupak among those representatives who had a rating of 67 in 2007-08 according to Planned Parenthood, and a rating of 33 or lower according to the National Right to Life Committee. (Note: no freshmen representatives are listed on this chart as they have not been rated yet.)