The reason I prefer the Real Clear Poltiics poll treport is that they average the values froma dozen polls across the nation.

Of course they may still be missing important demographics (such as 20-30 somethigns with only cell phones), but it's the best representation of poll-based information you can get.

RCP Average 09/21 - 09/28 -- 47.9 43.3 Obama +4.6
Rasmussen Tracking 09/26 - 09/28 3000 LV 50 45 Obama +5
Gallup Tracking 09/25 - 09/27 2719 RV 50 42 Obama +8
Hotline/FD Tracking 09/25 - 09/27 914 RV 47 42 Obama +5
GW/Battleground Tracking 09/22 - 09/28 1000 LV 46 48 McCain +2
CBS News/NY Times 09/21 - 09/24 LV 48 43 Obama +5
FOX News 09/22 - 09/23 900 RV 45 39 Obama +6
Marist 09/22 - 09/23 689 LV 49 44 Obama +5