Here's an interview with Democrat Rep. Bart Stupak from Michigan. He points out that there are 15 to 20 Democrat Congressmen who, I believe, previously voted for health care in the US House but won't in the future if the next bill includes taxpayer funding of abortion which the new Obama health care bill does. There's not a lot of discussion on that in the media but I'm sure Congressional leaders and the President's people are aware of it. Though I wonder if they're thinking they can jam it through and these folks won't in the end vote against it.
Stupak notes there are other reasons members of Congress won't vote for Obama's bill as it currently stands.