CNN CNN Newsroom With Carol Costello September 2, 2015 14:18:00
Top a press tton and athena jones. mark, walk us through the changes. >> i'll try to make it as simple as possible. when we created the criteria, we were looking at national polls as one of the main cry steiteri will continue to do so. you have to hit a minimum threshold to be invited. what we discovered and what we thought is that there would be an abundance of polls from august through september. in fact if you go back to 2011, you saw 15 polls that were conducted during that time and if you go back since, you saw 16 polls. the problem is that right now there are only three national polls th...
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