The midterm was a referendum on Trump,
I disagree. Red states became redder. People said Trump would turn off more voters with his midterm rhetoric, but several Trump backed candidates did much better than the polling suggested. All the states that Trump held rallies in, the numbers were better on polling day.
As much as this year’s midterms offered an obvious opportunity to rebuke Trump, little of what the Democrats and members of the mainstream media expected and predicted would happen actually did.
Voters had a chance to repudiate Trump and they really didn't. Much of the commentary had been about who we are as a country and what America is all about. Well, a lot of America still seems to be about supporting Trump. The Democrats thought Trump’s negatives would be enough to ease them to a big victory. The 2018 results show it is clear they need a different plan to win in 2020.
If you look at the House votes and project that on to a presidential election in '20, Trump could lose the imaginary popular vote by several million and still win the electoral college.
unless you think the Democrats won on the strength of their message and candidates
A crucial test for any Democrat nominee in 2020 is -- what are your chances of carrying Pennsylvania, Michigan and Wisconsin? If they’re good, you’re a good choice. If they’re not, you’re a terrible choice.
Pay attention to the way Democrats in Pennsylvania, Michigan and Wisconsin won. They mostly stayed away from far left, progressive candidates, and carefully hand picked them especially for those districts.
Messaging also played a big role. In Michigan, the winning slogan was, ‘Fix the damn roads!' That was the bumper sticker, 'Make America Great Again' level. Democrats can win in the Midwest, they proved that in these midterms, and there is a way they can do that and a way they cannot.
But, in a general election, the way to do it will alienate most of the base, especially on the coasts. Whomever the nominee is will be walking a tight rope while juggling dozens of balls.