This notion has been pushed by libertarians for the past several decades, on the surface it may SOUND like the best plan, but it's actually designed to destroy the moral fiber of our Republic.
Just over two centuries ago the Founding Fathers decided that the only way to unify the states was to accept a truly immoral compromise that left a very critical social issue to the states. For the next six decades this issue festered until it finally exploded.
If we learned anything from slavery, it should be that it is IMPOSSIBLE to have a Republic where a human being can be considered a person in one state and not a person in another. Yet this is EXACTLY what is being proposed when it's suggested to let the states decide abortion for themselves.
There are plenty of states where few if any abortions are performed and there is no reason to believe that adopting a "pro-choice by state" policy would save a single life. There would be NOTHING to stop a woman in a pro-life state from going to a pro-adoption state to kill her baby, unless you want to suggest a FEDERAL law that prohibits this, in which case it's back to being a federal issue.
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The only way one might believe that this is an issue that should be decided on a state by state basis is if one did not believe that abortion is murder. This is where we can see whether someone really is pro-life or whether they are actually pro-abortion, imho.
Amen, Wagglebee!
Personhood NOW!!! Mississippi 2011.