joining me now, the author of the cracker barrel versus whole food analysis, david wasserman of the cookeport and larry kramer, former dean and current president of the hewlett foundation that added polarization to the list of global robs it seeks to tackle. explain, why did the gap grow? >> thanks for having me on. a lot of people including democrats think that if we were to end gerrymandering, if we were to have an impartial robot draw all of our political maps or at least take it out of the hands of politicians, we'd have a bonanza of newly competitive seats but i'll take a slightly contrarian view to that because what we've seen and we calculate swing districts a little bit differently than 538 has but we've seen a 56% decline in the number of competitive seats in the house since 1997, but according to a study, we're going to put out next month, 83% of that decline has been attributable to factors other than redistricting which happens every 10 years. what's happening is that voters are gerrymandering themselves. they're choosing to live in like minded areas where the vast majority o