Craig was a rancher reportedly. Seems to be in the pocket of Big Agriculture.
From Wiki:
""Senator Larry Craig attempted to amend the Iraq War supplemental bill with AgJOBS bill (S. 359). The AgJOBS amendment would have granted legal status to roughly 500,000 to 1 million illegal immigrants in farm work. However, Sen. Craig was only able to garner 53 of the 60 votes needed for the amendment. 60 votes were needed instead of the usual 51 because the amendment was not relevant to the matter at hand. He is a supporter of President Bush's Guest-Worker Program. A version of the AgJOBS bill legislation is included in the Senate-passed immigration reform bill."