A state senator has withdrawn a proposed ban on so-called partial birth abortions, after he says opponents hobbled it with an unfriendly amendment today on the Senate floor. Minnesota Public Radios Eric Jansen reports from the state capitol: The author, Republican Senator Tom Neuville, says he withdrew his proposal to ban what are commonly called partial-birth abortions because an amendment by another senator changed it so drastically it would have been ineffective: "I dont want to put anything on the books any laws