Mead, Hickenlooper; "We are concerned that this is not the right decision."
Wyoming's Barrasso, Mead, have helped shape debate about changing the landmark preservation law.
Despite reservations, governor lets bill, opposed by scientists, become law without his signature.
National Park superintendent worries the proposed removal of federal protection for grizzly bears could diminish wildlife watching in the world’s first national park.
In latest test for endangered species, feds and state face off against conservationists.