FILE - This Sept. 6, 2012 file photo shows singer Glen Campbell performing during his Goodbye Tour in Little Rock, Ark. Campbell will be in Washington, D.C., Monday, April 22, 2013, advocating for Alzheimer's disease research. The trip includes attendance at a fundraising dinner for the Alzheimer's Association and a visit to Capitol Hill where he'll appear to underscore the importance of Alzheimer's research on a visit to the Senate. (AP Photo/Danny Johnston, file)
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