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• Mahala Greer, Denver, a student at University of Colorado Denver

• Adrienne Howard, San Diego, a military spouse

• Mike Krieger, San Francisco, co-founder of Instagram

• Lorelei Kilker, Brighton, Colo., an analytical chemist

• Joan Milligan, Orlando, Fla., refinanced her home through Mr. Obama’s Home Affordable Refinance Program

• Amber Morris, Virginia Beach, responded to White House Twitter question during last year’s payroll-tax debate

• Juan Jose Redin, North Hollywood, Calif., an attorney

• Bryan Ritterby, Holland, Mich., a lab technician

• Col. Ginger Wallace, McLean, an Air Force intelligence officer