CNN’s expert data analyst Harry Enten has warned Democrats that their lead in national polls is soft, and doesn’t guarantee them a House majority. Looking back at polling data from before the 2006 and 2018 midterms, Enten identified a statistic that he believes should worry Democrats. CNN data guru Harry Enten warns Dems could lose midterms, despite lead. The disconnect between President Donald Trump’s poor poll performance and the popularity of the Democratic Party is what is driving the Dems’ soft national lead. President Donald Trump's approval rating is deeply in the negative.