Mark Dayton

Midwest primaries test Trump appeal against 'blue wave'

Midwest primaries test Trump appeal against 'blue wave'

Democrats are fighting to beat back Republican gains across the Midwest as the 2018 primary season roars through Wisconsin and Minnesota, two states where President Donald Trump's appeal among working-class voters threatens to upend decadeslong political trends this fall and beyond.

Tuesday's primary contests for governor, the U.S. Senate and the House will measure the strength of Trump's fiery coalition against the energy of the Democratic resistance. At the same time, accusations of domestic violence involving the Democratic National Committee's second-in-command could undermine any blue wave in Minnesota, a state still healing from scandal.

In all, four states hosted...