Your fears should be alleviated. Mitt Romney now cannot sign a bill overturning Roe v. Wade. I, however, was never fearful of that, for I know that a bill cannot overturn a Supreme Court decision. Roe v Wade, by the way, has not "been federal law for 50 years." It is a Supreme Court decision that established legal precedent for our current abortion policy. If the Supreme Court ever did overturn Roe v Wade, Congress would then have to put forth a bill for our president to sign. I'm surprised, given your respective educations, that you didn't know that. I learned it in high school civics class. But then, I'm just a hack.
Nick Williams, Breckenridge