JMC Enterprises offers a shocking poll in Mississippi, all the more surprising since it looks like they bent over backwards to not be too optimistic for the Republican:

This survey was conducted October 18-23, 2010. The margin of error, with a 95% confidence interval, was 4.53%.
There is some debate about the “true” racial breakdown of the district. The 2000 Census says that the racial breakdown of the district is 63/35% black/white. This breakdown, however, is for all residents of the district as of April 1, 2000, regardless of whether they are registered to vote. The best available information available shows that the racial breakdown for the district’s registered voters is 54/46 black/white. This racial breakdown becomes 50/50% when we look only at “likely voters” (as opposed to registered voters).The racial breakdown of those who responded to this poll, however, was 60-40% white (compared to 63-37% white in the first survey). Therefore, where appropriate, we have weighted the survey answers to reflect the racial breakdown of those we believe who will vote in the general election – an electorate that is 50-50 white/black.
Question 3: If the election were held today, who would you vote for?
Democrat Bennie Thompson 42%
Republican Bill Marcy 41%

Bennie Thompson is an 8-term incumbent Democrat in a district scored D+12; in recent cycles, Thompson has won 60 to 69 percent of the vote.

Could Bill Marcy pull off the cycle’s biggest upset?