In a call to action for the prevention and cure of Alzheimer's Disease, legendary musician Glen Campbell visited Capitol Hill on Tuesday (May 15). The iconic entertainer, who disclosed his battle with the disease in 2011, was joined by wife Kim, his children Ashley, Cal and Shannon (all pictured above), and Harry Johns, CEO of the Alzheimer's Association.

The Washington Scene reports that daughter Ashley tearfully delivered a speech at the conference, recalling times she would go fishing with her dad and how, soon, he "won't recognize who I am."

Also in attendance at the conference were Glen's friends, actress Jane Seymour and her husband, James Keach. The two are advocates for Alzheimer's Awareness. Keach, a producer of the Oscar-winning Johnny Cash biopic, "Walk the Line," is producing a documentary film chronicling Glen. A feature film about his life is also in the works.

Rep. Ed Markey (D-Mass.), who is part of the Congressional Task Force on Alzheimer's Disease, announced at the conference the Dept. of Health and Human Services' National Alzheimer's Plan, a result of bipartisan legislation authored by Rep. Markey. The plan includes the goal of treating the disease by 2025.

Glen is currently on his Goodbye tour, with dates scheduled this weekend in Kentucky and Pennsylvania. On June 7, he'll perform as part of the 2012 CMA Music Festival. Keep track of his tour schedule here.

Watch Glen Campbell Sing 'Wichita Lineman' Live in Our Studio