I think it's everywhere but the South.
According to the Research 2000 Daily Tracking poll, Obama leads by 28 points in the Northeast, 11 in the Midwest, and 9 in the West. He only trails in the South, which is by 18 points. (4 point lead). It's interesting that Obama's lead is only at 4 points in the poll. When I put the crosstab numbers in against the geographic regions, I get a 6 point Obama lead. The 4 point lead must be part of a likely voter model.
DC, ME, VT, NY, MD, PA,CT, DE, MA, NH, RI, WV, NJ
South:
FL, NC, SC, AL, MS, GA, VA, TN, KY, LA, AR
Midwest:
IL, MN, MI, OH, WI, IA, MO, KS, IN, ND, SD, OK, TX, NE, CO
West:
NM, CA, OR, WA, AK, HI, MT, ID, UT, NV, AZ, WY