Oklahoma supreme court rules personhood effort "is clearly unconstitutional"

From The Blaze/AP:

The Oklahoma Supreme Court on Monday halted an effort to grant “personhood” rights to human embryos, saying the measure is "void on its face."

The state’s highest court ruled unanimously that a proposed amendment to the Oklahoma Constitution that would define a fertilized human egg as a person violates a 1992 U.S. Supreme Court decision involving a Pennsylvania case and “is clearly unconstitutional.” Supporters of the personhood amendment are trying to gather enough signatures to put it before Oklahoma voters on the November ballot.

The ruling is the latest setback for abortion opponents who have been pursuing personhood measures in several states. In December, a judge in Nevada ruled that a personhood initiative petition was vague and could not be circulated for signatures to qualify for the 2012 ballot. Similar personhood proposals were defeated last year in Mississippi and Colorado.