The debate helped Edwards.
In tracking polling, pre-debate Edwards had 0% black support in SC. After the debate he is pulling 5% of the black vote in SC, an increase of INFINITY PERCENT.
Seriously, though... in post-debate tracking Edwards added 5% back vote, Hillary's black vote number went up 2% and Obama's dropped 9%.
I assumed the debate would demolish Hillary's remaining black support in SC, but I may have underestimated the sophistication/complexity of voters. Any South Carolinian of color who wasn't supporting Barack before the debate probably had resistance to him for whatever reason. A black voter who feared he would be jumped all-over by the Republicans would have had her view reinforced by the slug-fest, for instance. And there is not telling just how vile the name Ronald Reagan is among black voters old enough to remeber the recession of 1982. (The worst down-turn since the depression) I would guess there is a generational divide in the black community just like there is everywhere else, and it is simplistic to view the black vote as a monolith.
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Reuters/Zogby Poll: Obama's Lead Slips in South Carolina
Sen. Barack Obama's lead over Sen. Hillary Clinton in South Carolina has shrunk by four points overall and by nine points among black voters, during the last 24 hours of polling, but he retains a sizable edge, the latest Reuters/C-SPAN/Zogby survey shows.
Obama in in front with 39% support from likely Democratic voters, followed by Clinton at 24% and John Edwards at 19%.
Key finding: "Obama still has a healthy lead among African American voters, but lost almost nine points since yesterday, dropping from 65% to 56% support among that group. Edwards, who registered no support from black voters the day before, picked up five points and Clinton added about two points to reach 18% of black support."
http://politicalwire.com/archives/2008/01/24/reuterszogby_poll_obamas_lead_slips_in_south_carolina.html