Primaries in four states Tuesday — Minnesota, Connecticut, Wisconsin and Vermont — set up competitive governor’s, Senate and House races across the country this November. But even before then, these primaries identified some clear winners and losers that reinforced trends we’ve been seeing all year. Here they are: Winners Trump: At least in Republican primary politics, Tuesday once again proved he’s the king. Republican politicians on the ballot Tuesday who dissed him in 2016 raced to undo that, and those who didn’t do it convincingly enough lost their primaries. In Minnesota’s competitive governor’s race, Republican voters nominated a relative outsider,...