State Rep. Francesca Hong’s (D) steady rise in the Wisconsin gubernatorial race is teeing up the biggest test yet for democratic socialists and the far left this election cycle. Hong has held a strong lead in the Democratic field ahead of Tuesday’s primary, while establishment Democrats, including Wisconsin Gov. Tony Evers, have rallied around Milwaukee County Executive David Crowley. Evers and others have suggested Hong is unlikely to beat the GOP’s presumptive nominee, Rep. Tom Tiffany, in November and that she could even have a negative effect on Democrats running in competitive downballot races. But Hong argues that voters are...