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Caring for a loved one with Alzheimer's: "Hardest job I ever had"

Carol and Mike Daly promised to love each other in sickness and in health. As Carol battles Alzheimer's, they've battled the tough times together. CBS News chief medical correspondent Dr. Jon LaPook has been following their journey for the past 10 years to see what many families dealing with Alzheimer's endure in private.
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