Conservatives vote Republican because they think Democrats favor redistributionist policies like a more progressive tax system, a single-payer healthcare system and a robust minimum wage. Progressives don't show up at general elections because Democratic politicians don't actually push for those things. There's much to gain and little to lose by laying out an unapologetically liberal series of campaign promises focused on addressing the problems of the poor and middle class, as well as such scandalously neglected crises as the opioid epidemic, excessive military spending and out-of-control college tuition costs.
Democrats could also steal some of Trump's nationalist thunder by promising to prioritize labor and the environment in international trade agreements.
Party leaders are understandably reluctant to stamp a one-size-fits-all platform across an ideologically diverse series of contests, including many where conservative Democrats have to run in red districts. But they can't avoid it. As they did in 2014 and 2010, Republicans will nationalize the midterms by framing their opponents as lapdogs of a radical "San Francisco liberal" -- House minority leader Nancy Pelosi -- and Senate minority leader Chuck Schumer, a slick New Yorker. Democrats had might as well own it.
Similarly, Republicans will say that Democrats are coming to take away their guns, their freedoms and their president -- so they must defend him. Who cares if Pelosi says impeachment is "not someplace that I think we should go" if Democrats take back the majority? No one who listens to Rush Limbaugh will ever hear her.
Since they won't lose any swing voters by doing so, but they would generate enthusiasm among their currently weak progressive left flank, Democrats had might as well own impeachment too.
Everyone already knows that November is all about impeaching Trump. If the Democrats really want to win, the first promise in their national platform for the 2018 midterms ought to be a clear, unequivocal pledge to get rid of the president.
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