A new report from the Alzheimer's Association says there are nearly 15 million Alzheimer's and dementia caregivers in the U.S., far more than previously reported.  The "2011 Alzheimer's Disease Facts and Figures" report shows these caregivers provide 17 billion hours of unpaid care, valued at more than 200 billion dollars.  Beth Kallmyer oversees constituent services for the Alzheimer's Association.