I don't know — when Chris Christie calls something "partisan politics," he almost certainly knows whereof he speaks.
I'm not quite sure how it fits in with traditional Republican politics to reject a bill passed twice by elected legislators in favor of "in-state experts" in the government. Though I'm sure it will make him look a lot more attractive to the caucusing citizens of Iowa.
Christie vetoes pig crate ban, accuses sponsors of partisan politicking
Gov. Chris Christie unconditionally vetoed legislation banning the use of pig gestation crates in New Jersey today