Answer this question - when a person murders another, which laws is he tried under - federal or state ?
Why is abortion any different ?
All states must adhere to the basic protections of the God-given rights to life and liberty.
For any state to begin to legalize murder, or rape, or theft, or any number of other crimes which abrogate the unalienable rights of any of the poeple of this country, is to make the Constitution meaningless, a dead letter.