“Each day, the IBD/TIPP Presidential Tracking Poll data will reflect a survey of 800-1,000 likely voters conducted over the prior five days. As in prior years, TIPP — the polling arm of nationally recognized research firm TechnoMetrica —will conduct live telephone interviews. However, TIPP will supplement phone interviews with online surveys this time to better capture younger voters. (Scroll down for more on the IBD/TIPP Tracking Poll methodology.)”
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So the poll is supplemented with ONLINE surveys to better capture younger voters.
Who are not a reliable group for showing up on election day.