Ron Brownstein: “Detailed new research by the Democratic voter-targeting firm Catalist found that the party’s big gains in the 2018 congressional election were fueled not only by unusually high turnout among voters sympathetic to the party, but also by larger-than-expected defections from the GOP among voters who had backed Trump two years earlier.”

“Those findings offer potentially critical evidence as Democrats are debating the best approach to beating Trump in 2020. On one side are progressive activists who say the party should prioritize mobilizing nonvoters, particularly young people and minorities, with an unabashedly liberal agenda. On the other are centrists who say Democrats can’t tilt so far left on issues such as single-payer health care and the Green New Deal that they alienate swing voters who backed Trump in 2016 but may be open to reconsidering now.”

“Rather than picking one path, the new Catalist data on 2018 signals that Democrats need to do some of both in 2020. But, on balance, its analysis found that a clear majority of Democrats’ gains from 2016 to 2018 came from voters switching their preference, rather than from changes in the electorate’s composition.”

A new Emerson poll in North Carolina finds President Trunp’s approval at 41% to 52%.

In possible presidential match ups, Joe Biden leads Trump 56% to 44%, while Bernie Sanders leads 54% to 46%.