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Could find for 608 state level senator and governor races between 1998 and 2014 comparing those poll results with actual electoral results find the historical margin of error plus or minus 6 to 7 points. that's an error range of 12 to 14, not typically reported 6 or 7. expand on that, please. >> polls can be wrong for two reasons. we say, sampling error and non-sampling error. it's because you sample a finite number of people and like drawing bulls from the urn. you won't see the entire population. that's the margin of error. not sampling error is because you're not getting the right people or...

>> so from that same summation of your work, i, too, want to quote. i'm going to put it up on the screen. i thought this was remarkable. we examined -- this is part of your research, 4,221 late-campaign polls, every public poll we could find, for 608 state level presidential senate and governor's races between 1998 and 2014, comparing those poll results with actual electoral results, we find the historical margin of error is plus or minus six to seven percentage points, yes, that's a error range of 12 to 14 points not the typical reported 6 or 7. explain that fleez. >> we say sampling error an...