CW Pittsburgh MS Walk April 19, 2015 April 23, 2015 / 10:20 AM EDT / CBS News DSCF3057 DSCF3056 DSCF3055 DSCF3054 DSCF3053 DSCF3052 DSCF3051 DSCF3050 DSCF3049 DSCF3048 DSCF3047 DSCF3046 DSCF3045 DSCF3044 DSCF3043 DSCF3041 DSCF3040 DSCF3039 DSCF3038 DSCF3036 DSCF3034 DSCF3032 DSCF3031 DSCF3029 DSCF3028 DSCF3027 DSCF3026 DSCF3025 DSCF3024 DSCF3023