First Lady: 'Have pie! Eat the dressing!' By Elise Viebeck - 11/27/10 11:36 AM ET First Lady Michelle Obama encouraged American families to enjoy their food over the holiday weekend and not to worry about "how much you eat." Obama, who is spearheading a nationwide campaign against childhood obesity, explained to 20/20 host Barbara Walters that "this is the time" to let go a bit. "I would urge people to use this time to come together, as families and community, and don't take it for granted. Be kind to each other and laugh a little bit. And don't worry about...