it is based on 3,000 interviews with registered voters and we provide analysis based on 9,000 interviews based on three-week rolling average. we are able to give people a stable picture of what's happening with the race as opposed to other polls where we saw obama was ahead by 13 points. clearly an out liar and daily tracking with large sample sizes, we think that we are making a real contribution to understand the trajectory, the trend line of the race. >> it's funny you bring up the out liar and bloomberg. we had criticism at that. she responded to it. one of the criticisms we talked about, the biggest difference in that poll and why obama had a bigger lead, again it was the race break down. she only had the white population under 70%. which we hadn't seen either. >> one credit to other polls including nbc and "wall street journal," at the end of the survey, every time you release