Pew Research Center says there is a bias for Republicans between polls using cell phones and those that don’t. The latter use land-lines and traditionally vote for the GOP, where cell phone users tend to be younger, Hispanic, Black and vote Democratic. Four out of five polls use only land-lines. In a most recent land-line poll, there was a difference of 12 points favoring Republicans. When cell phones only were used, that edge was reduced to only 7. Significant.
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