Rick mentioned it AGAIN in the debate tonight that abortion must be decided at the Federal level and insinuated others must as well (he did not specify which).
Roe v Wade is very bad law. It Federalized the lawful murder of the unborn.
That said, and as Paul pointed out in the debate tonight (no, I am not a Paul-bot...to preempt your constant resort to the ad hominem) there is no federal law against after-birth murder...or other violent offenses. The Constitution SPECIFICALLY EXCLUDES such law under the 10th Amendment.
Of course, you don't agree. You are another statist like Santorum that would have Federal Laws against all sorts of corrupt behaviors. I'm sure, if given the chance, you would insist your legislator not bother with a Constitutional Amendment and just go ahead and pass, then enforce, the Volstead Act.
Like all statists, you do not respect the Constitution.
The abortion issue is a federal issue. It derives this status from the Declaration of Independence where life is listed as being the first of the unalienable rights. If abortion was merely a states issue, it would be possible for it to be legal in one or more of the states. Since the right to life is an unalienable right, it is not possible for state legislators or voters to confer these rights, or to deny them.
The Declaration and the Constitution are taken together as being our founding documents. Upon them, all else rests.