FILE - In this Aug. 16, 2011 file photo, Republican presidential candidate Texas Gov. Rick Perry speaks to workers as he makes a campaign stop at D.C. Taylor Roofing in Cedar Rapids, Iowa. He calls it innovative. Others call it a big risk. In any case, the stem cell procedure that Perry had last month was an unusual experiment to fix a common malady: a bad back. (AP Photo/Charles Dharapak, File)

Associated Press
FILE - In this Aug. 16, 2011 file photo, Republican presidential candidate Texas Gov. Rick Perry speaks to workers as he makes a campaign stop at  D.C. Taylor Roofing in Cedar Rapids, Iowa. He calls it innovative. Others call it a big risk. In any case, the stem cell procedure that Perry had last month was an unusual experiment to fix a common malady: a bad back. (AP Photo/Charles Dharapak, File)
FILE - In this Aug. 16, 2011 file photo, Republican presidential candidate Texas Gov. Rick Perry speaks to workers as he makes a campaign stop at D.C. Taylor Roofing in Cedar Rapids, Iowa. He calls it innovative. Others call it a big risk. In any case, the stem cell procedure that Perry had last month was an unusual experiment to fix a common malady: a bad back. (AP Photo/Charles Dharapak, File)
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