The danger of using small sample sizes to reach big conclusions was demonstrated once again when a poll of 800 voters indicated that former Vice President Joe Biden had squandered his lead in the Democratic presidential primary, only to have a larger survey released two days later that showed him with a still-comfortable edge over his closest pursuers.
A Monmouth University poll released Aug. 26 showed Mr. Biden had slipped 13 points since it last took the voters’ temperature in June, dropping from 32 to 19 percent. His loss had been the gain of Bernie Sanders and Elizabeth Warren, as the Senators from Vermont and Massachusetts each hit 20 percent, with Ms. Warren picking up the most support since the earlier survey.
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