Part of your family is quite politically conservative -- think, loves Michele Bachman, GW and the rest -- and thinks that Obama, while probably not a Muslim, isn't a good choice by the country.
You've been part of this family for quite a while and have well-worn groves in your tongue from family holiday dinners. The patriarch of that part of the family is quite accustomed to speaking his mind -- and assumes everyone agrees. You realized long ago that fighting with patriarch isn't worth the effort -- and your sweet spouse makes a game of predicting what patriarch will go on about this time.
New wrinkle -- Your wonderful MIL has met and is smitten with a black man. This black man has (according to MIL) a passion for Obama and is quite the liberal democrat.
Normally family dinners are pretty mello -- this year... maybe not...