John McCain spoke to Western Growers on the 14th, at a meeting that he initiated (link). He still (of course) supports comprehensive immigration reform but he says it's not likely in 2010 due to it being an election year. He also said that passing AgJOBS is impossible to pass in 2010 as a standalone bill but only as a part of a CIR bill. And:

(Tom Nassif) said the Western Growers provided McCain with policy papers on the group’s concerns, including health care costs for seasonal workers and undocumented workers. Western Growers would prefer that part-time seasonal workers be exempt from insurance requirements... Currently, a majority of farm workers are not covered, he said... "How do you impose those costs on companies where they don’t have the financial wherewithal to do so?" Nassif said.

Part-time seasonal farm workers don't have the wherewithal to pay for their own healthcare at anything approaching the market rate, which means that Western Growers in effect wants subsidized labor in which some state entity would pick up their healthcare costs (in addition, of course, to all the other costs such as education).