He's played the tough talking Jack McCoy on Law & Order for 14 season, but does Sam Waterston know as much about the law as his character? "People do ask me for legal advice," he tells Rachael, "and they're just as foolish as if they represented themselves! Everything I know about the law I learned from Law & Order -- and playing Abraham Lincoln."

Sam gives Rachael the verdict on a few of his famous film co-stars, including Reese Witherspoon. "I knew her when she was just a little girl," he says, recalling 1991's The Man in the Moon. "I feel sort of like a proud father, because I played her father and it was the first movie she ever made. She was absolutely wonderful in that -- full of heart, and a smart cookie!" Check out the video above to see Sam's impersonation of his co-star in 1973's The Glass Menagerie, Katharine Hepburn!

You asked, Sam answered! Click here to watch a web exclusive backstage video with Sam Waterston answering questions from Rachael Ray viewers!