Tonight's the first presidential debate between Mitt Romney and President Barack Obama. And while the candidates have been facing off from their podiums on issues like the economy, health care, and Medicare, their wives kicked off the debate by greeting each other with hugs. The night is especially significant for Michelle Obama, who's celebrating 20 years of marriage to Barack today. And he addressed their important anniversary right from the start, saying, "There are a lot of points I want to make tonight, but the most important one is that 20 years ago I became the luckiest man on earth because Michelle Obama agreed to marry me. So I just want to wish, sweetie, you a happy anniversary and let you know that a year from now we will not be celebrating it in front of 40 million people." Check out these pics of the first lady and first lady hopeful, and be sure to watch our live postshow coverage of the debate later tonight!