If Stupak votes 'yes' on Sunday, it will be much more than 'compromising. He will have totally and completely sold out his pro-life stance. He will be granting the Executive Branch the power to mandate that insurers provide abortion coverage. Any and all additional language that is sent to the Senate will be rejected by Republicans and Democrats alike. Stupak knows this.
Stupka has to know that any deal Pelosi or the Senate give him to take out abortion is worthless. They will doublecross him and his group. He has to know that.