Barack Obama jokingly thanked the city of Boston for trading Kevin Youkilis to the White Sox during a campaign speech on Monday. "Boston, I just want to say thank you for Youkilis," Obama told the audience at Symphony Hall. The crowd began booing, in a loud but seemingly good-natured matter. "I'm just saying, he had to change the color of his socks," Obama said with a chuckle. The president is a known White Sox fan. Chicago acquired Youkilis from Boston in a trade on Sunday afternoon.