The International Association of Machinists and Aerospace Workers will hold its presidential forum on Aug. 27 and Aug. 28, and they've managed to attract a constellation of political stars from both parties: Sen. Hillary Clinton, ex-Sen. John Edwards, ex-NYC Mayor Rudy Giuliani, Sen. John McCain and ex-AR Gov. Mike Huckabee.

The IAM says that Sen. Joe Biden might also attend.

Sen. Barack Obama said no -- evidence, perhaps, that he's beginning to turn down appearances to forums. Some of his campaign advisers are frustrated about the demands to appear at these interest group "debates" -- they require prep time and make it nearly impossible to get anything else done on the scheduled day.

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