Incidentally John Edwards picked Boston Legal, and Hillary Clinton picked Grey's Anatomy. Make of that what you will.
Hillary Clinton is a fan of HGTV makeover shows, Grey's Anatomy, American Idol, and Dancing with the Stars, but her all-time TV favorite is The Ed Sullivan Show.
Barack Obama tells TV Guide that his favorite TV character of all time is "SpongeBob SquarePants, because SpongeBob is the show I watch with my daughters." His favorite TV shows of all time are M*A*S*H and The Wire.
John Edwards is a fan of Boston Legal, and tells TV Guide that his viewing guilty pleasure is "Fred Thompson on Law & Order."
Dennis Kucinich is a fan of late-night TV, citing The Tonight Show, Late Show, The Daily Show, The Colbert Report, and Saturday Night Live as his favorites. "When I get a chance to watch TV, it's usually late in the evening," he tells TV Guide. "Those shows have brilliant writers. It's just great to watch them." He also adds that he doesn't mind being the punch line of their jokes. "It's hilarious. I take what I do seriously, but I don't take myself seriously."
John McCain lists Prison Break among his favorite TV shows "because as a fellow prisoner, I always dreamed and plotted how I would break out of the Hanoi Hilton," he tells TV Guide.
Mitt Romney tells TV Guide he is a fan of Lost because it has "a very captivating plot, and if you live a busy life, escape is always welcome."
Fred Thompson's favorite TV show is SportsCenter. He tells TV Guide, "I always need to stay up on my Titans, Vols, Vanderbilt and, of course, my Memphis Tigers."
I think a lot of these answers are a bit self-serving. I read a blog which suggested that picking the Wire was a way to signal covertly that you know 'The War on Drugs' ain't working.
Does it make you feel differently about people when you know their show? It does me.