A large majority of Colorado voters rejected one amendment while Montana voters never had a chance to vote on the proposal there.
Backers of the amendments will host kickoffs in both states on measures they say will recognize the rights of all citizens, including children who haven't been born.
In Montana, pro-life state Rep. Wendy Warburton is working with the Montana Pro Life Coalition and Personhood USA to organize a petition gathering campaign. The groups plan a rally on the steps of Montana's state capitol on Wednesday morning.
"This effort is about loving mothers, loving babies, and building a society where every single one of us is valued, no matter how young," she said.
Dr. Annie Bukacek, the head of the coalition, added, "Based on their intrinsic value and dignity, every human being, from the moment life begins, deserves equal protection under the law. This is the principle of personhood. It's high time the people of Montana had an opportunity to vote on this fundamental human rights issue."
On Thursday, in Colorado, Colorado Right to Life and Personhood USA will introduce a similar amendment for Colorado's constitution. They plan a press conference on the steps of the state capitol.
Keith Mason of Personhood USA talked about the effort, which pro-life advocates are duplicating in Oregon, Mississippi and several other states this year or next.
"This question should have been settled in 1865. There should be no 'three-fifths of a person' - not in Montana, not in Colorado, not anywhere. All humans are people," he told LifeNews.com. . .