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Question for the weekend: What part of 'Mexico' was the South Carolina debate crowd booing?

It's been a few days now, so those of you who saw Monday's Fox News GOP presidential debate in South Carolina have had time to mull this one over. What do you think the crowd was booing when moderator Juan Williams addressed candidate Mitt Romney's Mexican roots?

Romney's family history has been the subject of much media coverage lately, including this week on KPCC. In a nutshell, he's the descendant of Mormons who moved from the U.S. to Mexico in the late 1800s, fleeing American anti-polygamy laws. His father and grandfather were born there.

The Blaze had an analysis a few days ago with a few different possible interpretations, but it's still a head-scratcher. While Romney didn't mention his connection to Mexico much until recently, he has made a point of doing so lately without incident, including during Thursday's CNN debate in South Carolina. During Monday's debate it was Williams who brought it up, and the fact that Romney still has family in Mexico, before launching into questions about his position on immigration.

Was the Fox debate crowd booing Mexico in general? Were they booing Romney for having roots and relatives in Mexico? Were they booing Juan Williams for bringing it up?

Post your take in the comments below.