Ron Brownstein: “Cracks have emerged in Donald Trump’s hold on his core constituency of white working class voters, new data from the 2018 election reveal.” “Though Republican candidates almost everywhere registered large margins among white voters without a college degree, Democrats ran much more competitively among the roughly half of that group who are not evangelical Christians, according to previously unpublished results from the 2018 exit poll conducted by Edison Research for the National Election Pool.” “Democrats, the analysis found, ran particularly well this year among white working-class women who are not evangelicals, a group that also displayed substantial disenchantment in the exit poll with Trump’s performance.