the first time. mark kelly has kept a constant vigil by her bedside. he's speaking to diane sawyer. we'll have a first look at the exclusive interview in just a minute. >> we're so looking forward to that. >>> and people across the country marking the legacy of martin luther king jr. today. on saturday, he would have been 82. this is the 25th year that the nation is observing the king's holiday. i had a chance while i was in atlanta to sit down with some of the people who worked with dr. king. hear what this day means to them. >> so young, only 39 years old. >>> also later this morning, the debate over vaccines and autism. the doctor who claimed to link them has lost his medical license. a brand-new study charges him with perpetrating an elaborate fraud. the researcher andrew wakefield is here to answer the charges live in a "gma" exclusive. >>> but we are going to begin with gabrielle giffords' husband breaking the silence on her remarkable recovery. tomorrow abc news is going to air...