Arizona Chamber of Commerce endorses John McCain

Per the president of the Arizona Chamber of Commerce Glenn Hamer:

"Throughout his congressional career, Sen. McCain has been a consistent champion for our state and country’s entrepreneurial spirit and for policies that encourage job creation and free enterprise... In this past year alone, Sen. McCain has stood strong against job killing legislation like card check and has injected the debate over health care with much-needed real world perspective. The Arizona Chamber is proud to make this much-deserved endorsement."

McCain's strong support for massive and illegal immigration and guest workers was almost assuredly a large factor in their decision. JD Hayworth's immigration plans would be more likely to cut into the profits of companies that want to use or profit from illegal labor.

Of course, there are probably other reasons too (link):

State chamber members include Phoenix-based beer distributor Hensley & Co. McCain’s wife, Cindy Hensley McCain, is the company’s chairwoman, and Hensley Vice President Doug Yonko is a vice chairman of the chamber.