The map was exactly the same after 2010, except for NC; it lost its uniqueness 
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Hey Miles, how in the world did Joseph Cao (R) win the New Orleans district in 2008?
I am not Miles, but i know: extreme corruption on part of Jefferson, who still managed to win primary, and low turnout..
Basically this.
Keep in mind the election wasn't held on the same day as the Presidential/general election; it was a month later (rescheduled because of Hurricane Gustav). Jefferson would have likely hung on if the elections were held concurrently. The problem for him was that only a third of the November voters showed up.
Number of votes cast in the district:
November- 200K
December- 67K
Map:
Notice that Cao narrowly lost the Orleans Parish part of the district. Still, in Orleans Parish, you had white liberal precincts that were >65% Obama massively defect to Cao. Also the 9th Ward (the easternmost group of red precincts) is one of the least elastic areas; its usually uniformly >95% Democratic but Jefferson was averaging the the low-80s.
Jefferson, by contrast, was blown out in Jefferson Parish (ironically enough). The Democratic electorate there was (is) more working class and less machine driven; meaning they were less likely to hold their noses for Jefferson.
