So most Democrats see the necessity of passing the Bill, including those Congressmen in districts which preferred John McCain to Barack Obama who expect to pay a personal electoral price if they vote for the Bill.
The Washington question may increasingly become less whether they have the 216 votes they need, but which 216 votes they pass the Bill with.
Nate Silver of fivethirtyeight.com explains the game theory dynamics.
They are also captured in this Jeff Zeleny New York Times report on how Democrats are weighing success versus survival.
as the week inches along, with momentum steadily building to a Sunday vote, the party leaders are also beginning to decide which politically endangered lawmakers will be given absolution to vote no.
Uber-anoraks can watch the Congressional waverers in pretty much real time at David Dayen's Health Care Whip Count.
And liberal critics of the Bill in the Democratic Party, who wanted it to be stronger, are increasingly swinging behind it - with polls now showing liberals generally support it by 89% to 3%, after MoveOn members voted 83% in favour. Nate Silver again explains the mood shift: in which liberal Democrats increasingly see an imperfect Bill as a cause very much worth fighting for.