After last week’s election in Wisconsin, many once-gloomy Republicans are hopeful that they can prevent Donald Trump from winning the party’s presidential nomination. If they do, their reaction had better be more than, “Whew, glad that’s over.” They cannot go back to business as usual.

All is not well in the GOP. Party leaders need to recognize that although Trump is the wrong messenger, the message he carries from his supporters is one to which Republican bigwigs must pay attention. Trump is a symptom of the party’s failure to address real voter concerns and make a compelling case that Republican and conservative policies can meet them. If they don’t do so, the country is headed toward a long period of Democratic dominance.