InsiderAdvantage NC Primary: Clinton With Slight Lead

InsiderAdvantage North Carolina Poll conducted 4/29 of 571 RVs:

Clinton 44%
Obama 42%

This is the only poll to show Clinton ahead, so are they on to something or are they way off? It appears to be a sampling issue, as the poll surveyed 70% white voters, and 25% black voters-most other polls have had black voters at something closer to 60%-35%. Obama also leads by only 64%-20% among African-Americans, a much smaller margin than what other polls have shown and what he has won in other states. One thing has been consistent in NC-the age gap. Obama wins 54%-29% among voters 18-29, while Clinton wins voters 65+ by 54%-32%.